Completely discounting the possibility of any deity, as opposed to a specific one, seems to be a rather large leap of faith, though. How can you be any more sure that no God's exist than someone else is that a particular God exists? Both are essentially merely hypotheses.
Doubt is not the same as faith.
I doubt greatly there is any supernatural creature. I do not place faith or wagers on that, this is why I am an agnostic. I am not saying there is conclusive proof there is no God or gods. I am saying there's massive amounts of evidence that the kind of God man imagines is just his imaginings, primarily because he's imagining it, not actually witnessing it.
I will place an opinion on it though; in my opinion the idea of a God (such as the Biblical God) is beyond ludicrous. Especially as written in the text, because he's often contradictory, wrathful, jealous, hateful, racist, uncaring, misogynistic, and a mass murderer. He's also the embodiment of mercy, compassion, and infinite wisdom. And he will send you to hell forever if you do certain things. So, God is either a psychopath, or there are grave errors in the description of him in the bible.
Add to the fact that this book is written by ancient men, you can account for all of the wrathful, ignorant, unscientific, hateful, racist, uncaring, misogynistic behavior of God. Makes perfect sense if it comes from the imaginings or desires of ancient man. It also explains the historic and scientific inaccuracies.
It also explains the concept of hell; God is full of love, infinite power, infinite wisdom, infinite compassion, and his solution for a person who doesn't believe in him because he caused that person to be of a skeptical personality and therefore doesn't accept the fantastic story of him or his son, is to burn that person (his creation, mind you) forever. Even man is not so cruel and ignorant, callous and cold. That and thousands of other discrepancies show the Biblical god to be a fiction of man, in my view. Not a very advanced man, either.
Now, why only that God? Why not a God just like that, except with flowing white hair and no beard, instead of one with a beard?
-Essentially they are the same God, and the same fiction.
What about a God that doesn't have Jesus as a son?
-Changes one aspect of the fictional character, doesn't change the fictional nature of the character.
What about a seven-headed serpent that will come and devour the world on the 7th hour of the 7th day of the 7th month of the 7th year of the 7th millenia C.E.?
-As cartoonish and predictable as Wile E. Coyote. There's no reason to believe in this obviously fictional deity either.
What about Chaos, Uranus, Gaea? By the beard of Zeus, don't you believe in any of them?
-Why should I? These are all poorly conceived fictional characters, too. Though they make excellent fodder for Hercules and Xena television shows as well as video games.
What about gods from Lovecraftian (Cthulu) mythology?
-Why should I believe in a deity I know was conceived by man's imagination?
What about a nameless, faceless generic Creator... don't you believe in that?
-No... because then that runs into the problem of
who created the creator, and what was he doing for ALL ETERNITY before creation happened. Especially since Eternity is so long a time that it isn't over yet and will never be over.... so if there is an Eternity that exists before the universe is created, the universe will never be created.
So what began time; what created God? There's nothing that suggests a Creator poofed into existence. If that is the case, so can the universe also just poof into existence. No God required. And we are stretching the definition of God to suggest He is merely "that which began the universe". Then it might not be a God at all, but a natural event. It's certainly not conclusively or even compellingly a God.
There's nothing to suggest a God except man's imagination. And like all random thoughts I have in a given day (The Fire-Breathing Leprechaun is my own creation) I do not believe these are real deities that rule over me.
There's no proof, no reason, and it is rather vain of man to think that if there is such a being, he could comprehend such a thing, and speak with any authority on what it could possibly be. So especially when men say they know what God is, or they understand what God wants, I call that hubris.
The best answer is "I do not know" and "there's nothing suggesting it is so" when it pertains to the supernatural.
If you randomly imagined any god, any diety... surely you realize that there are literally endless other variants and configurations to what comprises this God. Why on Earth would one assume they have got God pictured correctly at all, if such a thing exists? And why would one presume that they know something exists when there's no evidence for it whatsoever?
The Great Fire-Breathing Leprechaun has a mythology of his own. He has a Great Magic Box that he hides inside, and that is why no one can see him. Inside this box with him are an unknown number of items. Either zero or any number.
Describe those items in detail.
Now, why would you assume you know what is inside the Great Magic Box? Why would you think you know that with any level of certainty that suggests you should spend more than a nanosecond of your life thinking about it?
Why would you turn it into a religion and teach others what you think you know about what is inside the Great Magic Box? Why would you dedicate your life to an entirely random, pulled-straight-from-one's-hindquarters GUESS.... and why would you presume you know enough about the contents of the Box to tell others their religion is incorrect, or their guess as to what is inside the Box is incorrect?
It's totally random. it's man's imagination.
You are essentially arguing, ah, what if man could guess what is inside the Magic Box that can never be opened, and describe its contents. What if someone could. What if they were right. What if they were absolutely, 100% right. Or, even partially right. What if they guessed the exact number of things in the box. What then?
Who cares? There's no proof. And still no reason to believe it. No rational mind should waste any more time thinking about it. Yet we have wasted THOUSANDS of years debating the existence of God, what he thinks, and what he wants for us, and what other supernatural beings exist. It's the most pointless, fruitless exercise I've ever seen. And the amount of suffering, hatred, and devastation, the holding back of scientific progress, and the handicapping and fracturing of mankind, based entirely on theories of God, has set humanity back untold generations, with losses of innocent lives, freedoms, and creativity totaling an unknown but staggeringly devastating amount.
Not even a tiny fraction of the time we've wasted on God has been dedicated to turning this world, this human civilization, into a better place. Instead of relegating the status of God and questions about the unknown to its rightful status as a daydream or a hobby, it has been one of the main focuses of the combined might of billions of minds, and the result has been absurd. Most of us disagree. Many of us fight over it. Nothing conclusive has been reached. And we will never, ever settle on who or what or if God is. What might have been a fun diversion and mental exercise has become the intellectual plague of mankind.
Since the odds of any one imaginary mythical beast being real are essentially zero, and there's no evidence for any of it, AND it's obviously our imagination since we have to come up with it ourselves, then it seems entirely logical to suggest "I don't know if it is real, but there's no reason to believe any of it is."
So God, along with an infinite number of other fictional creations, all get placed in the "creative, but useless" section. No 500-foot tall sheep who can travel through several dimensions.... no Invisible Pink Unicorns who are both invisible AND pink at the same time.... no flying Spaghetti Monster... no Fire-Breathing Leprechaun... no Jehovah.... no Santa Claus.... no angels, no demons, no hell. All of it, nothing more than our imagination.
Now, let us suggest, what if God were an alien creature, evolved from a distant planet, who traveled here and made the earth as a science project for school? Ah, now you're in the realm of still absurd, but in the realm of the natural world, even if it is science fiction. That's a theory, just as God is a theory. Well all hypothetical beings are theories of equal weight, without any supporting evidence.
I don't believe humanity was created by an alien being. Which is essentially what God would be, just phrased differently than is commonly stated. Where did the alien being come from? What created that? Who created that which came before that?
How can you be any more sure that no God's exist than someone else is that a particular God exists?
Because the probabilities are so greatly in my favor.
How can you be sure the Great Fire-Breathing Leprechaun doesn't exist? Well, it doesn't. I made it up. It's total fiction.
Odds of GFBL existing: as close to zero as mathematically possible.
Odds of GFBL being imaginary: as close to conclusively proven as a negative that can be possible.
I didn't just blindly guess the exact nature of the universe by inventing a fictional deity. The odds are against it. I'm not even done writing all the back-story for this absurd creation, so you know it's still wrong.
Now, the odds are basically the same for all imaginary deities, because they are the same as the Great Fire-Breathing Leprechaun. Without any evidence, you, a flawed mortal human being, with your limited (or my limited) cranial capacity, made the absurdly unlikely exactly correct guess as to the nature of something that is not of this universe; that is outside it, beyond it, superior to it. Right... An ant has an infinitely better chance of calculating the exact number of grains of sand there are in the universe.
That humanity thinks it can conjure up an image of something supernatural in their heads and then also think it is real... and I'm not talking about vehicles that can colonize human beings outside of the solar system, I'm not talking about anything with a rational scientific basis, I'm talking about an indescribably powerful being of pure fantasy, pure fiction, based on absolutely nothing. Then think they know this being exists, even though they just made it up.
The only way I can describe it is a disease of the mind.
And that's just it, everyone's interpretation or imagining of God is slightly different. Are we all correct? Does God look exactly like what Askthepizzaguy imagines it would be? Or is it more like Dave's God, in Butte, Montana? Or Long Chin Pao's 6-headed deity in Asia somewhere?
There's well over 6 billion of us. The odds are near zero that any of us are correct. And then you realize that only one of us would have the correct image of God in our heads, because we all imagine God slightly differently. So only one person, possibly, even remotely, could conceive of this God correctly. Everyone else is wrong.
You see that it is utterly ridiculous to place the non-existence of any god as a "leap of faith". It doesn't take a leap of faith to
not believe in a 17-armed plasma-based creature from a dimension so alien from ours that we could never possibly imagine it, because we lack any familiar frame of reference with such a plane of existence. If that were what God was, we would never know, because it is beyond our imagination and comprehension. You factor that in with the stupefyingly ridiculous odds of successfully guessing that there is a God, and what it wants, and what its plans are, what it's nature is, and what it looks like... and you add on top of everything the fact that you probably are literally incapable of intelligently comprehending such a being, and it seems clear to me that man is deluding himself when he thinks he understands God, or knows there is one.
There is an inherent value to a hypothesis... if one tries to guess how many fingers someone is holding up, there is a reasonable assumption that one could eventually guess correctly.
If one tries to guess the exact date and time of the birth of someone now dead for two millenia, that might be possible, depending on how exact you want to be. It would be extraordinarily difficult.
If one tries to guess the exact distance between two random atoms in the universe, 100 years into the future from now, there is no reasonable expectation that you will EVER guess this distance. However, it is still possible. But what would be the point anyway?
If one tries to make a hypothesis about the nature of God, there is no reasonable expectation you will ever know a darned thing, ever. And, I might add, it's very, very likely that it is literally physically impossible because there just doesn't seem to be one, and it is exactly the sort of thing man's mind dreams up on a constant basis, none of it having any relevance. And then you add on the fact that there's no logical method of arriving at that conclusion.
To put it simply: God would have to prove its own existence, since man cannot. And since God is just another name for the creature of one's own unique imagination, out of billions of minds, in a universe too vast to comprehend, it's quite silly to think one has it right. Like all other absurd things, it's only rational to start off placing such concepts in the "No reason to believe it is true" bin. If something changes, then yeah, pull it out of the bin. But until then, I'd prefer to make hypotheses with a far better and real chance of being relevant.
Not all hypotheses and theories are conceived equally, after all. If there are things that don't exist, there is an endless number of such things. Our imaginings are a subset of those things which don't exist except in our heads, and hypotheses about imaginary things existing in the real world, especially when they are based on nothing but our own fantasies and desires, not evidence or even rational deduction, are very likely to be false.
You also have to consider how many other imaginary beings besides God we know are just fictional creations... why would God suddenly not be one of them? I honestly feel, at times, that God is the Santa Claus that adults can't bear to stop believing in.