How can Christians trust Jesus as their Savior when the Old Testament warns against trusting in a son of man?

The context of Psalm 146 reveals that the 'son of man' mentioned is a reference to fallible humanity, emphasizing that one should not place hope in mere mortals who ultimately perish. The Psalmist contrasts this with the eternal nature and faithfulness of God, who is the true source of help and salvation. Therefore, the warning is not against Jesus specifically, but against trusting in any human being for ultimate salvation. Furthermore, the term 'son of man' is used in various biblical contexts to denote humanity's frailty, as seen in Job and Isaiah, reinforcing that the phrase does not inherently disqualify Jesus from being trusted as Savior. Instead, Christians believe that Jesus, while being the Son of Man, is also the divine Son of God, making Him uniquely qualified to provide salvation.