I'm an atheist because it's what makes the most logical sense to me. All the inconsistencies, lack of evidence, and thousands of other religions that around the world have influenced me to not believe in god. By the way, it's not a choice that i made, it's a realization and even if i wanted to, i can't believe in god.
I grew up protestant by the way, when i started to think about things, that's when i started to realize this. Oh yea also, it's not like i think "There is no god, no matter what," i would believe in a god if there was physical evidence.