I was raised in a very moderate Chrisitan setting, but thankfully, I rarely had to waste my time attending church. Around the time I entered Middle School, I began to really question my religious beliefs. But, I was still very young, and at the time I did nothing about it.
I was in high school when I realized how much of an impact religion has on society, so I really began to study Christianity, as well as many other religions. I found them to be ridiculously flawed and socially corrupted. The more I looked into it, the more unappealing it became.
Even though I realized that existing religions aren't for me, that didn't necessarily rule out the existence of a God. Around the time I graduated high school, I became very interested in science. Since then, I've studied it fairly extensively, and begun taking courses in college relating to religion and humanity.
Today, I am an atheist, and proud.