You’re going to need to cite chapter and verse on that, and please identify the translation you’re utilizing. It sounds as if you’re denying Jesus was fully human (and neither was Mary by inference), while simultaneously insisting that he was. Humans are subject to temptation to sin. Jesus was subject to temptation to sin, but did not.
Hebrews 2:14-18
Since the children have flesh and blood, he too shared in their humanity so that by his death he might break the power of him who holds the power of death—that is, the devil— 15 and free those who all their lives were held in slavery by their fear of death. For surely it is not angels he helps, but Abraham’s descendants. For this reason he had to be made like them,fully human in every way, in order that he might become a merciful and faithful high priest in service to God, and that he might make atonement for the sins of the people