What caused you to stop believing in the Bible?
I can highlight some key items that pushed me in that direction, if you want me to elaborate on any of them just ask.
1. After reading a few books of the old testatment I really started getting the idea that "God" thought/acted much like a human. As an example, Moses states that "God" told him to order the Israelites to kill every man woman and child [Midianites etc] save the virgin girls; they were to be spared and awarded to the soldiers and priests. Sorry man, that story just reeks of humanity [human based desires/actions] to no end.
2. I honestly don't think the Bible describes our physical world accurately. I don't believe the global flood story and I don't believe the garden of Eden creation story is literally true. If the Bible can't accurately describe the physical world, how can I trust it for some invisible/ethereal world?
3. From the moment I asked Jesus into my heart [age 6 or 7] til my late 20's I've never once experienced anything supernatural. I started to contemplate this more, as time went on, I started to consider that perhaps there is NO supernatural world. Or even if there is one, what does it matter; we can't really make any predictions or know exactly what this spirit world entails. So for now I've simply filed it away as "Don't believe it til I have reason to".
4. I became less and less impressed with the Christian worldview that I had grown so accustomed to. Pray for something, if it works out in your favor...praise God...if it doesn't...it was God's will. How can you ever fail? This was a worldview that, if you looked through the right lens, everything fit so nicely, snug as a bug in a rug. What is more important to me is, is it reality? I don't care so much about being comforted, or made to feel special, or told that God has a special plan for me; I want to know what is reality. To express it in another way, I'd rather shiver in the coldness of reality than be warmed by the fires of delusion.
5. I could go on a bit more but I think I have the major points. Ultimately, I'm not so much an atheist as I am an agnostic. I also have questions just like everyone else, I just don't feel confident in assigning any one "identity" to the cause of the big bang. My guess is that it's something none of us have imagined.