My first college degree was from a Christian college. While there I took 5 of the religion classes, I also did Mathematics there. One of them was the interpretation class and because of my young age some how believed what the professor said in that class. Along with my work, I also taught adult Sunday school classes at the church I was at. While doing that I was also working on a second degree at a public university. I then said it was time to read the Bible from beginning to end yet again, I had already done that twice, and the contradictions and killings finally started my questioning. I also pulled out my college notes to see what they had to say and couldn't reconcile any of it.
It then took me about 6 months to evolve from deism to agnosticism.

Because I could clearly see it was benefiting some and not all.

I was a believer, raised mostly Conservative Baptist. I always had an issue with the idea of God sending good people to Hell; but it was what I was taught and I was taught not to question God. Well, in my early thirties I began to question the Bible and whether it was indeed inspired by a God and infallible. It didn't take long for me to discover that it isn't. My journey from believer to atheist took about ten years. I first thought I was a "Liberal Christian" who didn't take the Bible literally but that didn't stick. Why cling to Christianity at all? I wondered. I then looked at other belief systems and none made sense to me so I settled into Deism. But, I didn't stop there, I continued to learn, which included learning more about the science I had been taught to fear and ignore; I soon realized that there is no evidence for a god and there is no need for one for the universe to behave as it does. And, since I pleaded with the god I believed in to not let me get led astray, and I ended up being an atheist, I can only surmise that there is no god; or, if there should be one, it doesn't know or care what I think or believe.

Where do I begin? Because going to church is fucking boring. Taking time out of my life to pray and do all that other shit, unnecessary. All these fucking rules about not touching your wiener, but they go and rape little boys. A bunch of expensive rituals: Baptism, communion, confirmation, confession, marriage. Trained to be afraid of shit that isn't even harmful to anyone else or one's self. I'm already scared of rabies, now I gotta be scared of some dude in the sky that watches my every move? And I gotta be scared of some dude who makes people do shit like some evil Professor X. Pfft, fuck that. Too much shit to worry about.
Also, I got into ancient(classical) mythology from the Navajo to the Greeks to the Chinese. "So, you're telling me that everyone else is wrong - possibly millions, if not hundreds of thousands of interpretations of the world's creation etc. and you're the right one because you call your shit ALL-powerful, I gotta see this. Why should any of you be right to begin with?"

What's interesting is to look at the scientific knowledge we have today vs. what they had in the year 1 A.D. If you thought the Earth was the center of the Universe, and the stars were just points of light rotating around in the sky, the idea that God created Earth and focused all that attention on it could potentially make sense. Now that we know we are just one tiny planet rotating around one of 1,000,000,000,000,000,000,000,000 stars in a Universe that was created ~14,000,000,000 years ago, you would literally have to be insane to believe the Old Testament stories.