Well, yeah, but the aforementioned cognitive dissonance... actually not that big a deal. After the events of the past few years, the c.d. from trying to stay a conservative Christian would be far greater. (This probably deserves a post of its own.)

Anyway, anyone who chooses to believe something other than their parents' creed (whatever that may be) is going to have the same problem, to some extent. It's not specific to Christianity.