“Who is the “god” of islam?”
He is the one who is the father of all who reject the Son:
“18 Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour. 19 They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.
20 But you have an anointing from the Holy One, and all of you know the truth. 21 I do not write to you because you do not know the truth, but because you do know it and because no lie comes from the truth. 22 Who is the liar? It is whoever denies that Jesus is the Christ. Such a person is the antichrist—denying the Father and the Son. 23 No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.” 1 John 2:18-23
“39 “Abraham is our father,” they answered.
“If you were Abraham’s children,” said Jesus, “then you would do what Abraham did. 40 As it is, you are looking for a way to kill me, a man who has told you the truth that I heard from God. Abraham did not do such things. 41 You are doing the works of your own father.”
“We are not illegitimate children,” they protested. “The only Father we have is God himself.”
42 Jesus said to them, “If God were your Father, you would love me, for I have come here from God. I have not come on my own; God sent me. 43 Why is my language not clear to you? Because you are unable to hear what I say. 44 You belong to your father, the devil, and you want to carry out your father’s desires. He was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies.” - John 8:39-44
Islam must and can only be defeated through the triumph of secular reasoning and rational examinations of dogmas, and application of philosophies thousands of years older than a highway robber's religion from an insignificant primitive stone age culture incapable of surviving without predation of cultures greater and better than themselves.
History could not be any clearer.