Jesus’s incarnation saves. The incarnation of the Son of God is an essential precondition for his saving work, as Paul shows in Philippians 2:5–9:
Christ Jesus, who, though he was in the form of God, did not count equality with God a thing to be grasped, but made himself nothing, taking the form of a servant, being born in the likeness of men. And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross. Therefore God has highly exalted him and bestowed on him the name that is above every name.
Salvation Accomplished by the Son (Wheaton, IL; Crossway Books; 2011) p. 24