When I was a little kid, I took what I was told at face value and didn't question it.
Magical thinking is normal for little kids. By about age 7 you're supposed to have grown out of that shit though - like it's normal to still enjoy the concept of magic, but there comes a point when you should have a pretty intuitive understanding that it's fiction.
For some reason we give religion a pass.
Some old dude in a dress raving about how ghosts built the pyramids is instantly recognized as crazy; but some old dude raving about how the chief master ghost shat out our entire universe in a week is... somehow worthy of respect?
So, my religion is no religion: I believe what can be tested and verified.
The most concise test to disprove the notion of God is one of simple logic: the Epicurean paradox, which recognizes the mythology of God being composed of three core pillars: that he is 100% good (complete absence of evil), 100% powerful (his will is our reality), and 100% omniscient (he knows everything about everything)... but despite those three pillars, it takes no time at all to recognize evil behavior all around us, and for evil to be able to exist in our reality, one of those pillars must always fall.
He either doesn't know evil is happening in his universe, is powerless to stop it, or is okay with it.
Every single time a religious person attempts to address the Epicurean paradox, the just shuffle the pillars to fill in the gap left open by the missing third (feel free to take that as a challenge if you think you've got the answer).
Anyway, it became clear that at the very least, my religion wasn't being honest about the nature of its own god, and that realization was the final nail in the coffin for me.