"My interpretation is that the “God of Abraham” was not Jesus. Abraham did not pray to Jesus."
Hmmm...Then perhaps you can address some of these points:
John 1:1
In the beginning was the Word, and the Word was with God, and the Word was God.
Colossians 1:15-20.
He is the image of the invisible God, the firstborn over all creation. For by him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things were created by him and for him.
He is before all things, and in him all things hold together.
And he is the head of the body, the church; he is the beginning and the firstborn from among the dead, so that in everything he might have the supremacy. For God was pleased to have all his fullness dwell in him, and through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross.
Revelation 1:8,17
"I am the Alpha and the Omega," says the Lord God, "who is, and who was, and who is to come, the Almighty."
When I saw him, I fell at his feet as though dead. Then he placed his right hand on me and said: "Do not be afraid. I am the First and the Last."
For kicks, you can also check out John 8:58, among others, where Christ claims Himself to be God. The God of Abraham is Jesus. Put another way, Jesus is God incarnate (literally, "in the flesh.")
The Koran denies this, and so from a Christian point of view, the Koran is heresy, Mohammad is a heretic and a false prophet, and Allah is a false god.
What ever are they teaching in Sunday school these days?!?!?