Hmm...
Not only offensive, uninformed, and overall mean spirited, it's also not that great a flash. The animation could use some work, (though the God finger pushing the girl under, while grotesque, was pretty funny).
I understand why this sort of thing is made, so I won't bother berating the underlying message. This is hardly a place for that. All I will say is that I just watched the "Origin of Jesus" and, though I am very relgious, found it hilarious.
So yeah, it's offensive. I think that was the point though, so good show. Mission accomplished.