I like to describe myself as an igtheist–one who doesn’t care whether God exists or not.
However, I attend a Lutheran church every week, and I play guitar for the children’s choir and sing in the church choir. I do this because I really like the people in the congregation, as well as the opportunity to share my love for performing music and singing with people.
How do you go about choosing a church? Think about it this way: choosing a church is like choosing a supermarket. Some folks go to the nearest one to their house. Some stick with a particular chain because they prefer it for whatever reason. Some go to the one that sells at the lowest prices. Some go to the ones that offer the highest quality product. Some go to the ones that give away free food samples.
Going to church is not so much about believing in God than it is about liking the community of people that attend church at a specific location. Your criteria for choosing a church will likely differ from someone else’s, but in the end if you go to church, go because it provides you with the value you’re looking for, not as a statement about your belief (or lack thereof) in God.