My personal disinterest in religion as an activity doesn't rise to the level of 'philosophy', though. I also don't enjoy cooking--is that a philosophy?
actually that would depend on your reasons for cooking & any beliefs you have about it. but archangel nailed it, your atheism shapes & is shaped by your concept of the world around you & how you relate to it.
philosophy in & of itself isn't "deep". we all have philosophies even if we don't examine them closely or think about them very much.
also, disinterest in religion as an activity doesn't qualify as atheism. that's just ambivelence . atheism is the belief that there is no god. a lot of folks confuse atheism with various forms of agnosticism.
jf