I am having a debate with my SIL at the moment and both of us think the other is crazy!
She says that quite a lot of people who go do church don't believe in God but still go and take their kids 'because that is just what you do'. She was using the example of a friend who started going to church again after many years of not because she now has children and 'that's just what you do'.
I think that people who go to church might be doing it because of reasons of traditional but I also think that most (as in like 99%) of people who go to church believe in God (have faith that there is a God). If you don't believe in God you don't go to church...