So then they that are in the flesh cannot please God. Marvel not that I said unto thee, Ye must be born again. Sinful flesh can only beget sinful flesh, as flesh can produce only after it's kind. The Spirit of Jesus bears record in that Jesus was sinless. God created us to live in space and time and to see and understand things in a certain manner.
Water is symbolic if cleanliness.
Baptism by water is symbolic of cleanliness from the filth of sin. God always speaks in OUR language. He came to save us looking LIKE US . When Jesus was baptized, the Holy Ghost came to empower Him. Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.