Disclaimer: Obviously this is totally hypothetical as that will never happen.
I personally still would not worship said deity/deities because they would have let far too many horrible acts be carried out without even trying to rectify these problems. Assuming they're all powerful, this would make them highly morally flawed and not something I would want to connect myself to.
IF such an event were to occur I've never been one shy away from admitting I was wrong. But at that point I would probably just accept my fate and start Mr. or Mrs. Deity what the hell their problem is and why they let shit get so messed up. I'd hold them acountable.
Agreed. Obviously I wouldn't deny that there was a deity/deities if there was undeniable evidence for one, but that would hardly make me bow down to them considering all the evil in the world.