i as a nonduche atheist will not flame your beliefs but just point something out. lets just say jesus did live from 34 b.c.e to 0 c.e. even though the first written history of his so called "existence" was dated to as early as 600 c.e, what if he already did come back. what if he came back a long time ago and deemed humanity as worthless and cruel beyond saving and decided to let the race die off on its own? a great example of such time wld be douring hitlers rule, what if jesus came back in 1940 and saw the attemptive genocide of the jewish people and as a jew himself he decided that if man is capable of such hate and destruction that we are not worth saving?
From a Christian stand-point there are many refutations to your proposed theory. The first refutation is the fact that God is omniscient and already knew how bad the world would become due to sin.
Psalm 139: 4-6 states, "For there is not a word on my tongue, But behold, O Lord, You know it altogether. You have hedged me behind and before, And laid Your hand upon me. Such knowledge is too wonderful for me; It is high, I cannot attain it."
If God already knew that he hated humanity, then the omniscient entity wouldn't have created the world or sacrificed Jesus Christ to die for the sins of humanity. the second refutation is that God sent Jesus Christ so that sinners could be forgiven and go to heaven.
John 3:16-17 states, "For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life. For God did not send His Son into the world to condemn the world, but that the world through Him might be saved."
Assuming that you are referring to the Second Coming, it is discussed throughout the Bible and has particular concentration in the book of Revelation. Even though the validity of John as a reliable author during his exile on the island of Patmos is widely discussed among Christian theologians and believers themselves, the book is seen as a divine inspiration given to John and thus the first verse can be read, "The Revelation of Jesus Christ."
It is within the Book of Revelation that a third refutation explains that the conclusion of Jesus's Second Coming will result in a utopia where there is no sadness, no death, and no pain. Those who still have committed sins and haven't sought repentance will suffer in the lake of fire.
Revelation 21:4 states, "And God will wipe away every tear from their eyes; there shall be no more death, nor sorrow, nor crying. There shall be no more pain, for the former things have passed away."
Due to the fact that there is still pain, sorrow, and death it indicates that Christ hasn't already returned, Revelation is a faulty passage, or that the Bible shouldn't be taken on a literal level. Since we are talking about a figure that is assumed to be true based on the text, I also feel that it is appropriate to deny your suggestions according to the text.