If God exists and he (or she) revealed themselves, would people who believe in God actually accept God as God?

Yes most likely since people believe in stuff more with what they see with their own eyes.

Remember back when Jesus lived (Physically). People didn't accept him as the messiah, even though he was, in fact, the son of God (Or God in the flesh). So based on that, I would only presume that people of this day and age would NOT recognize "The highest" as God himself.