For me, my journey started when I started wondering if there was a god or not. That started very early in my pre teens. It seems like the most important question to the whole thing. I really wanted to know. I came from a very religious family, and I considered myself a Christian, because my family members were all Christians. Of course, none of that training means there is a god. It was easy to say, "There is a god," since I had that drilled into me, but that's not the same thing as there being a god. In other words, I put my belief aside in my search for proof. Belief is just belief. It's not the same as knowing something, although many people think they are the same. They are not.
While this was going on, there was always a strong undercurrent of suspicion on my part. There was something about all the Bible stories, and my parents informing me of the nature of God that sounded just a wee bit fishy, like someone was making it up. Yet in America one is surrounded by believers. That should count for something, except that it doesn't prove anything about the existence of a god. On the other hand, most of the entire world believes in a different god, and they believe that just as sincerely or insincerely, as all the people I knew that said they believed in the Christian god.
Now that leads to three possibilities. Either Christians are right, and all those others are wrong. Or all those others are right and Christians are wrong. Or everyone is wrong. It seems like there could be a fourth possibility that everyone is right, but since these beliefs are mutually exclusive, someone has to be wrong, so I excluded that early on. So the problem always comes back to whether any god exists at all.
One thing that all gods have in common, however, is that there is no actual evidence for any of them, which kind of suggests that all of them are false. People say there is evidence, the most compelling to me is that they have actually experienced god in some personal way, usually some feeling accompanied by a sort of ecstasy that tells them they have found a god. However, as much as I recognize their epiphany, that doesn't prove god either. People just get warm fuzzies now and then, myself included, but it can be written off as a self induced jolt of dopamine to the body. While I realize others find this compelling, it doesn't prove anything to me.
I searched for such an experience for years, even had some temporary successes, but unfortunately, none of those successes proved anything either. They were just biochemical reactions. As I got older, I learned about logical fallacies. They are published in list form all over the internet. My first encounter was with Carl Sagan's "Baloney Detection Kit." It's nothing special. It's just another list of logical fallacies with a short description of each. Look it up, and see how almost every logical fallacy can be a superficially compelling "proof" that there is a god. The problem is that being fallacies, they don't prove anything. They cancel out all logical attempts to justify a god.
In a way, I kind of wish there was a god, but there just isn't any credible evidence to be found. You would think an all powerful being would be a Hell of a lot more straight forward about making himself known, especially if he wants everyone to believe in him. But instead he seems to be spending all his energy on hiding, like he wants us to believe, but it has to be through some mystical process. Tin foil hat technologies have proved to be ineffective at detecting god. But it's the kind of process he seems to want to be known by. I know God is beyond our comprehension and all, but a perfect being should be able to communicate perfectly, and do it without requiring weird mental gymnastics.