First we have to clarify who was the Son of Man the NT writers wrote about..
In the NT, the Son of Man does refer to Jesus and the NT writers might have 'believed' and thus wrote that we would see Jesus return in the clouds, but that is nothing Jesus said.
Moreover, the OT says that the messiah would be one
like the Son of man.
Christians believe that the following verses are about Jesus, but if Jesus was the Son of man, as Jesus claimed to be, the following verses cannot be about the Jesus.
Daniel 7:13-14 I saw in the night visions, and, behold,
one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him. And there was given him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed.
I believe that those verses are about Baha'u'llah who was
one like Jesus.
I believe that Jesus ascended into heaven. and Baha’u’llah, one like the son of man, descended from the heaven of the Will of God, and came to the Ancient of days, and they brought him near before him. And there was given him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed. Those verses are about an earthly Kingdom, not a heavenly Kingdom. Jesus’ Kingdom is in heaven, Baha’u’llah’s Kingdom will be on earth, after it is built by humans.
John 18:36 Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.