Explain the Triune God? If you can, then you're superior to all the worlds theologians. If thats the case maybe you are God, heh?
So what if the Muslims dont accept Christ literally as God, some Christians dont. Also Jews are supposed to believe in the same God as the Christians and they dont accept Jesus...so are you saying that when they address their father they are talking to the wind and nothing else.
Facts are facts. I won't you let you redefine Christianity - the bible is the authority for Christians. The bible says Jesus Christ is God and that there is One God expressed in 3 persons (a compound unity). If you don't believe it, you are no Christian. My authority for saying that is the bible, the apostles, and 2000 years of Christian history.
Muslims say Jesus is NOT God and that God is not triune which directly contradicts the Christian view.
Simply put, muslims and Christians disagree on the very nature of God, on who He is. Both cannot be true logically. You lose the argument.
Muslims do not believe in the "Father". The authority is the Koran for them - and their God is not the same God as the God in the bible. They contradict completely. Both can't be true - logic doesn't allow it. And they are speaking to a false God as much as the Philistines were speaking to a false God when they prayed to Dagon. So, yes, they might as well be speaking to a doorknob if they are praying to a non-existent God.