I don't see how any one can make the logical claim that God does not exist and is just a religious idea. I think that I can see their position. I did not have a religious background in any meaningful sense of the common usage of the term. I read the Bible and it was read to me, but there was no religious connotation and it was more like reading a book on history. I realize that most think that can only happen in a religious setting where one is indoctrinated by a teacher who is just teaching what they have been taught. I reject the claim that one can only understand the Bible when they are taught by another human.
Humans created both religion
and God (or Allah, Zeus, or any of the other millions of deities humans have created throughout prehistory and later).
I've read the bible. I've been to Sunday school a whopping TWO times, and I vaguely recall the teacher telling us about Hagar and Ishmael, and all the while I kept wondering where that bush came from if they were lost in a desert with no water. Through most of my life ('60s to now) most people around here took it for granted that the Old Testament was also a history book. In my Grade 12 English class we did debates, and I was assigned to argue in the affirmative that history should not be taught in school. I told the teacher that was a stupid thing to debate -
of course history should be taught in school, because where else would people learn it?
As I found out, she was all for doing it in church. This English teacher would assign us stuff from the Jerusalem Bible, and when we did poetry interpretation, we soon learned to put a religious spin on it to get a better mark. This was in a
public school.

In the Q&A portion of the debate, she asked, "What about the Bible? That's history."
My response was that most of the world did not believe that. She had no answer to that, but had to give my partner and me a passing grade.
She got me back later, though. She assigned me to be a judge for the creation vs evolution debate, knowing full well which side I personally supported and that the students arguing that side were two of the most inept researchers in the class. They did such a crappy job of presenting their arguments, without all the information they should have used, that I had to judge that the creation side had won.
As for the Old Testament being actual history, we've already had this conversation in OT. Neither the geologic record, dating methods, archaeology, or primary written sources support more than the tiniest smidgen of either of the Testaments being an accurate historical record.