I've never been to a church that required people to believe anything in order to engage in any particular way. Except to become a teacher or minister or priest, but that's fairly common sense I think.

But, yes, people will often discuss theology and proselytize. If that sort of thing angers you, maybe skip out after the music and then catch up with folks when the coffee or potluck starts. Or maybe skip all of the above and just sign up for the volunteer activities at retirement homes, women's shelters, etc.