Those that have committed themselves to a religion, like born-again Christians or the Baha'i Faith, are stuck. They can't say, "Oh, I believe all of it except this and that." If their religion tells them the Bible is literally true, they are obligated to believe that. If their religion tells them that Baha'u'llah is the return of Christ, then that's what they've committed themselves to believe. Of course, they can't get unstuck and question those beliefs, but then are they going to keep calling themselves a Christian or a Baha'i?