There is just one small detail you are overlooking... Jesus never promised to return to earth.
Jesus said His work was finished here, and He was no more in the world, and He was going to the Father.
John 17:4 I have glorified thee on the earth: I have finished the work which thou gavest me to do.
John 17:11 And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we are.
Yes, His work in the flesh was finished. He was going to return to the Father as He promised. However, that doesn't mean He would never return ... In fact, He indicates He would return in Acts 1:6-7.
Acts 1:6-7
When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel? And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
IN Matthew 24 when Jesus speaks of the return of the Son of man in the clouds; He is actually asnwering their question about his own return. Just check Matthew 24:3. His whole prophecy is in response to these questions.
- when shall these things be?
- what shall be the sign of thy(Jesus) coming?
- and the end of the age?
Matthew 24:3 And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and what shall be the sign of thy coming, and of the end of the world?
John 19:30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
There is not one single verse in the NT wherein Jesus promised to return.
Well, there is Acts 1 and you don't count Revelation?
- Revelation 3:11
- Revelation 22:7
- Revelation 22:12
Jesus saying we will see the Son of man in the clouds does not count because that is not Jesus saying He will return. It is Jesus saying what we will see.
More than once Jesus indicates He is the "Son of man". The history of this phrase "Son of man" should be understood in light prophecies predicting His coming at the time. For example the Son of man of the book of Daniel and also in the book of Enoch which would have been familiar to many Jews of the time. Which we see from the dead sea scrolls. To claim to be the Son of man was to claim to be the prophesied One. The Messiah and Son of God.
John 8:28
Then said Jesus unto them, When ye have lifted up the Son of man, then shall ye know that I am he, and that I do nothing of myself; but as my Father hath taught me, I speak these things.
John 12
32 And I, if I be lifted up from the earth, will draw all men unto me.
33 This he said, signifying what death he should die.
34 The people answered him, We have heard out of the law that Christ abideth for ever: and how sayest thou, The Son of man must be lifted up? who is this Son of man?
35 Then Jesus said unto them, Yet a little while is the light with you. Walk while ye have the light, lest darkness come upon you: for he that walketh in darkness knoweth not whither he goeth.
36 While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, and departed, and did hide himself from them.