There is no federal proscription that says gays are unfit parents. Nor unfit to be married (provided they marry someone of the opposite sex - something a good many have indeed done).
This is not what they're asking to do. They're asking to marry people they're attracted to, and you're aware of that. To say they're-
Nor denied the same rights as others.
Is farcical. It's equivalent to separate but equal, blacks can marry blacks, whites can marry whites, and then shrugging and saying what's the problem?
Gay men don't want to marry women. Gay women don't want to marry men. Just because they're allowed to, does not mean they are given fair and equal treatment under the law, nor does it mean they have nothing to complain about.
On a personal level, I feel you are wrong about the changing of sexual preference.
Doesn't matter if I were.
My belief is humans are so supremely adaptable; they can pretty much convince themselves of anything. And fwiw, there are indeed those that have changed their sexuality by concious choice. Thus the question is not can it be done (since it can) but should it be done. And my answer might surprise you: I dont think so. Be gay all you want. Engage in all the relationships you want. Just dont ask the other 97% of us to change the definition of a single word. Is that too much to ask?
I'm afraid the definitions of words change constantly, for one, and secondly, yes, it is too much to ask to treat an entire class of people unfairly because the thought of their relationships being treated equally and called the same thing makes other folks feel icky.
That's the long and the short of it. It's not equal in your mind, and that's the only reason to oppose it.
I won't go as far as to say you're a hateful person because of the views you hold; quite the contrary. At one point in my life, I held the same views. I think you're fighting for what you think is right.
I just feel it's not even close to being right.