I'll let you in on a little secret.
In christian theology, jesus is god.
He basicly sacrificed himself to himself, to save us from himself.
Just some good ol' preaching
I'll let you in on a BIG secret ( clergy hide it from the flock of God ) that Jesus is Not his own God.
Jesus knew who he was according to John 10:36.
John saw Jesus and John wrote that No man ( John was a man ) can see God as per John 1:18; 1 John 4:12
John also wrote that Jesus was the beginning of the creation by God Revelation 3:14; 1:5
This is in harmony with Colossians 1:15 with Jesus being first born or ALL creation.
God had No beginning according to Psalms 90:2.
So, pre-human Jesus was Not before the beginning as God was before the beginning.
God would send a ' seed ' (offspring of men) and that 'seed ' would bruise Satan in his head - Genesis 3:15
God sent the pre-human heavenly Jesus to Earth, and Jesus will head bruise (destroy) Satan as per Hebrews 2:14 B; Romans 16:20
Also, the resurrected ascended-to-heaven Jesus still thinks he has a God over him as per Revelation 3:12