Most theists don't believe in heaven any more than I do. Oh they say they do, but they mistake hopes for beliefs. How can you tell if someone really, really believes? Invent a time machine, go back, and ask a 9/11 hijacker.
One video response to this video suggested that people fear going to hell. Well, then that means that they don't really believe in the saving grace of Jesus Christ. That just shifts the doubt from one part of their faith, to an even MORE important part of their faith. Thanks. Furthermore, I don't really buy the whole "fear of hell" argument, because when a believer's infant dies, the parents suffer severe grief, yet I've never met a bereaved parent who thought that God sent their baby to hell. Nice try.