Sometimes Muslims will seize on Jesus’ favorite title for himself, Son of Man, as evidence that Jesus never claimed to be the Son of God or that he didn’t claim to be divine. There is a passage where Jesus uses the title, Son of God, for himself. But here we’ll deal with the claim directly – Does Jesus’ usage of Son of Man mean that he is emphasizing his mere humanity? At first glance, it would indeed seem that this title is emphasizing humanity. Perhaps Jesus knew that people would naturally ascribe divinity to him, given his many miracles, and he wanted to guard against this? However, as with so many other questions, a better answer comes from reading the passage in question in the context of the whole Bible.
Jesus isn’t the only one who is the recipient of the title, Son of Man. Many of you reading this know where I’m going, but the overwhelming majority of Muslims in the world have never heard of the book of Daniel, much less the vision of the Son of Man contained in chapter seven. Here is that vision from Daniel 7:13-14.
“I saw in the night visions, and behold, with the clouds of heaven there came one like a son of man, and he came to the Ancient of Days and was presented before him. And to him was given dominion and glory and a kingdom, that all peoples, nations, and languages should serve him; his dominion is an everlasting dominion, which shall not pass away, and his kingdom one that shall not be destroyed. (ESV)
In this passage, this Son of Man figure is pictured coming on the clouds of heaven. This is not merely a note about the mode of this person’s arrival. This is theophany language, phraseology used to describe when God reveals himself. Only YHWH is pictured coming on the clouds in the Old Testament. If the clouds in Daniel 7 are not meant to imply divinity, then, according to the scholar Peter Gentry, this would be the only time in about seventy Old Testament occurrences.
This Son of Man comes to the throne of the Ancient of Days, apparently possessing the kind of standing and glory necessary to approach the throne of God himself. Then he is given dominion and universal service (another translation could render this term as worship) and an everlasting kingdom. These two things, universal service/worship, and an everlasting kingdom, belong to God alone, as every faithful Old Testament believer would attest. But in this passage, the Son of Man is given both. Furthermore, he is mysteriously presented as distinct from the Ancient of Days, yet also possessing the unique attributes of the Ancient of Days. Sounds a lot like and the word was with God, and the word was God. Somehow distinct, yet somehow the same. The Son of Man is clearly presented here as mysteriously divine.
But how do we know that Jesus is alluding to Daniel 7 when he uses the title, Son of Man, for himself? Couldn’t he be using it to say he’s not God, as is the usage in Numbers 23:19? Maybe it’s just royal language like is used in Psalm 8:4? Or maybe Jesus has a particular affinity for the prophet Ezekiel, who is called Son of Man more than ninety times in his book? I actually find the linkage to the Psalm 8:4 and and Ezekiel helpful, though they are not usually mentioned in talking about the background to Jesus’ usage of this title. Apparently, the title Son of Man has Davidic-Messianic meaning as well as context informed by Ezekiel, the prophet who suffers in exile on behalf of his people. Very appropriate for the Messiah-King-Prophet who would suffer exile from God for the sake of his people.
But Jesus himself lets us know which passage he has in mind as the primary lens through which we are to view the meaning of Son of Man.
 But Jesus remained silent. And the high priest said to him, “I adjure you by the living God, tell us if you are the Christ, the Son of God.”  Jesus said to him, “You have said so. But I tell you, from now on you will see the Son of Man seated at the right hand of Power and coming on the clouds of heaven.”  Then the high priest tore his robes and said, “He has uttered blasphemy. What further witnesses do we need? You have now heard his blasphemy. (ESV)
Apparently the high priest understood Jesus’ allusion to Daniel 7 all too well. We also are to understand Jesus’ choice of the title, Son of Man, primarily through the figure of Daniel 7. This means that the title Son of Man is Jesus claiming to be divine every single time he uses it. And the gospels are absolutely saturated with his usage of this term.
Far from being a title that proves Jesus didn’t claim divinity, Son of Man is instead a radical self-claim by Jesus that he is with God, and that he is God, that he has received an eternal kingdom and is worthy of universal service and worship. So, if you ever encounter the objection that Son of Man is emphasizing Jesus’ mere humanity, take your friend to Daniel 7 and Matthew 26 and draw the connections. They are mysterious, yes, but they are clear.
Hamilton, Jim, With the Clouds of Heaven: The Book of Daniel in Biblical Theology