Q. I believe the entire sperm and egg, were from God and included no part of Mary or man (or angel) or the line of sin through Adam and Eve.
A. If Jesus wasn’t God His sacrifice on our behalf couldn’t have paid the penalty for our sins. If He wasn’t a man He couldn’t have been our Kinsman Redeemer. Only with God as His father and Mary as His mother (Luke 1:31-32) could He accomplish this. Also, Jesus had to be biologically related to Mary to be of the house of David and have a legal claim to David’s throne (Luke 1:32, Luke 1:69).