You don't understand Christianity. Wherever your "understanding" of Christianity came from, it obviously is not from reading the BibleThere are those Christians to whom the status of Jesus as God is more important than His deeds and words of wisdom. Those to me are superficial Christians, but that's just me.
Any Christian who doesn't believe that might be a nice, moral, religious person, but he's not a Christian.
The central message of Christianity is salvation from Hell through belief in Jesus Christ. Jesus' deeds and words of wisdom are inseparable from the fact that he is God. He would have had no authority to say and do the things he did unless he was God. His crucifixion could not pay the price for our sins if he was not God, and that is unmistakeably the central message of the entire New Testament. His words and deeds are of no real importance if he was not God and in fact he was a liar if he was not God. If you think this is "imagery of grandeur" that's your opinion, but it's what the Bible says.
There may be Christians who believe he was God but don't take his teachings to heart. That's irrelevant. The point is, Jesus being God is the entire basis of Christianity, and without that, there's no reason to be a Christian, and Islam does not recognize Jesus as God. Your claim that "99.99% of Islam and Christianity are the same" seems to result from you coming up with your own definition of Christianity in which Jesus as Son of God is somehow dispensable.
"I baptize you with water for repentance. But after me will come one who is more powerful than I, whose sandals I am not fit to carry. He will baptize you with the Holy Spirit and with fire.
His winnowing fork is in his hand, and he will clear his threshing floor, gathering his wheat into the barn and burning up the chaff with unquenchable fire."
Then Jesus came from Galilee to the Jordan to be baptized by John.
John 3:11-13
In my Father's house are many rooms; if it were not so, I would have told you. I am going there to prepare a place for you.
And if I go and prepare a place for you, I will come back and take you to be with me that you also may be where I am.
You know the way to the place where I am going."
Thomas said to him, "Lord, we don't know where you are going, so how can we know the way?"
Jesus answered, "I am the way and the truth and the life. No one comes to the Father except through me.
John 14:2-6