no no no! you've got me all wrong! i was just asking if the rapture happened would you believe in a the biblical god. why would you assume that i had ulterior motives? a smiley face is just a smiley face man...
Sure, in as much as if I actually saw a fat man in a red suit flying through the air on a sleigh drawn by a team of flying reindeer, I would believe in Santa Claus. The problem is, Jesus spoke is though he would come again and all of that stuff would go down in the lifetimes of those who stood before him. Seeing as that didn't happen the way Jesus said it would, there's no reason to believe that it will, in fact, ever happen.
Why do I assume that you have an ulterior motive? Your previous posts have identified you as a believer. I have observed, from past experience, that believers like to lure atheists in with questions like this, as if by saying that they would believe it if it actually happened is somehow a victory for them, when it hasn't happened, didn't happen when it was supposed to, and there is no evidence to suggest that it ever will. This is the type of thing that the average believer posting here would typically consider a clever trap. However, it's like setting a mouse trap to stop an M1 tank.
As graybeard said, if something extraordinary happens to you, you would probably have to assume that you would believe it, unless you could arrive on a more sufficient natural explanation.
Here's a question for you: If there came a time when there were three seasons of nothing but winter, and then suddenly there came forth a host of the undead led by Loki and Hel, and opposing them the Aesir and Einherjer led by Týr, Odin and Thor, would you believe in Ragnarok? Does the answer to this question do anything to actually lend any credibility, practical applicability, truth, or historical or predictive value to the claims made by to the old Norse legends? No, and it doesn't in your case either. It's as pointless as asking if I experienced an auto accident, if I would believe in it. Even as a hypothetical exercise it is essentially without value.
If a grave was found in the middle east, with the body of Jesus Christ (who is alleged to have rose from the dead and ascended into heaven, thereby forfeiting any opportunity to leave behind bodily remains) would you finally admit that the whole thing is a lie? Though I don't consider this event to be extremely probable either, it is far more likely than the hypothetical situation you posed, and furthermore there is still as of yet any evidence to support the idea that Jesus Christ was the divine son of the God Yahweh. There is as about as much proof for the divinity of Jesus Christ as there is for Gandalf. Gandalf had healing powers, was a modest wanderer, made vague predictions, spoke in riddles, was able to defeat demons, died, was risen, helped establish a new kingdom, and passed on into paradise. It's really not hard to make that kind of stuff up. People were doing it long before Jesus, in case you forget.