Yes I think many if not most believe some idealized panda petting version of "the truth" and in their version "Jehovah" knows their heart and will look out for them and turn a blind eye to their faults and not kill babies and little doggies etc etc.
Then there are the ones who don't really care about the beliefs and probably don't even know what they are supposed to believe and their reasons for being there are purely social.
There are ones that have doubts but would never say it out loud.