not all that great
It's really not your best stuff. It isn't really funny, and the girl just doesn't look, sound or act like she's 3. And it doesn't explore the questions of how Noah crammed all those animals on the ark, or how he gathered them up, or how he fed them. Basically, it only mocks one aspect of the story of Noah's Ark - there's so much more this flash could do.
When it comes to interpretation of the Bible, well, the Bible really doesn't say that all those people who died in the flood went to hell. But it seems like Christians usually believe that everybody who died before Jesus automatically went to Hell because they didn't have the salvation of Jesus. So the part where God sends the girl to hell works ok, I guess.
(I don't know where Jesus freaks get ideas like "the sinners were all warned before the flood" or "rain didn't exist before that and they laughed when Noah said God would send water from the sky". Those things just aren't in there. Maybe they've been watching crap like The Ten Commandments or something on TV.)
Basically, this was a good idea, but just wasn't done as well as it should have been. Pretty disappointing.