God does not have a mother.
Jesus is God. Jesus is one person both God and Man. Jesus has a mother. God has a mother.
Jesus who is Man could die for our sins. God who died for our sins.
If Jesus was only a man and not both God and Man your faith is in vain.
If God can die on the cross, God must be born of a mother.
Also. Motherhood does not diminish Godhood, since no where in the definition of the term does motherhood imply sole pro-generation. That does not even exist in natural reality.
You say, “God does not have a mother.”
Then you contradict the gospels, which tell us that Jesus, who is God, had a mother.