Did God come to earth and lay with or in other words have sex with Mary? Or was Jesus an Immaculate Conception? I've been told from one church that God place Jesus in Mary, that Jesus is fully God not part Mary. She was like a sarrogate mother. And that Jesus was God's only Son. Another church says Jesus is part Mary also. And That God has other sons. Which is true?
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 Mormons might believe that God had other children on other worlds, but I leave that to the Mormons to exactly clarify that doctrine. In any event, they still hold a high regard for the position of Jesus in this world.
No, God did not have sex with Mary. God reveals to us that He is spirit--not flesh. Sexual intercourse involves two physical bodies, and God the Father has never had a physical body--or anything physically necessary for procreation. Therefore, it was impossible for Him to have sexual intercourse with Mary.
Furthermore, God reveals the Jesus was not merely conceived of a virgin, but born of a virgin. Mary had never had sexual intercourse when she gave birth to Jesus. So, she could not be a virgin and have ever had intercourse with anyone--even God Himself.
So, God worked a miracle in the conception of Jesus' physical body in the womb of Mary. Without touching her physically, she conceived. So, Mary was indeed the physical mother of Jesus, but Jesus had no physical father.
It should be noted that Jesus is the eternal Son of God. He did not become the Son of God when Mary conceived. Because God is outside the physical universe that He made, the idea of father and son are not biological in nature. Rather, the father and son relationship indicates the Divine order, as the Father sends the Son.
Jesus, the eternal Son of God, became flesh in the womb of Mary, without ceasing to be God the Son. Thus, God entered into His own creation.
There is sufficient evidence to suggest that Mary had other children, but God did not. Jesus is the Father's only begotten Son. There is no other.