There are numerous prophecies specifying God will send His Messiah to redeem mankind and establish His kingdom of righteousness at the end of this age.
The Bible warns that a false messiah will rise up in the last days to push the world into a horrible crisis.
All through history hundreds of prophecies have been fulfilled and especially in this century. God declared that these fulfilled prophecies would prove that He was working in the world's future, Isaiah 48:3.