Jesus Christ i believe was a perfect human being. You're just looking at it from your basic worldview so you only understand the reprodutive process from a humans point of view and not that from an Almighty God of creation. God created the universe the earth and man and animal. But you have no understanding of the spirit person that God is so it's way over your day to day thinking capabilities chap at this moment in time.So was Jesus a human or an alien? No one has answered that yet.