Yes ... but He is one person, not two, and that Person is Divine. Because He is a Divine Person, His sacrifice is perfect ... therefore His sacrifice, carried out in His human nature, could atone for our sins.
Agreed. He is one portion of the three-in-one nature of God. He’s fully human as well as fully divine, at the same time, and I’ll leave it at that. I don’t really feel like getting into a debate on the theology behind this.