I go to a non-denominational church. They don't expect you to go every Sunday for service or every Wednesday for youth group, but they get a bit worried of you don't go at all for two weeks. I've gone to the same church all my life, so I'm not sure how they do the whole membership thing. They are quite pushy about everyone in the church attending functions and will get upset if you do not go, so that is a requirement to go to summer camps, picnics, parties, fundraisers, etc. It is also required that you dress a bit modestly. No short skirts, no tube tops, no short shorts. They also require you to tithe weekly for the church, and monthly for local missionaries. That is all that I know.