And the bottom line in Christianity is Islam denies the gospel, the Son, His deity, God's blood atonement, etc. The Bible is clear on the demonic character of such a religion, no nexus between Islam and Christianity, Islam even making our Lord Jesus and His apostles liars,
1 John 2:22 Who is the liar but the one who denies that Jesus is the Christ? This is the antichrist, the one who denies the Father and the Son.
1 John 4:3 and every spirit that does not confess Jesus is not from God; this is the spirit of the antichrist, of which you have heard that it is coming, and now it is already in the world.
2 John 1:7 For many deceivers have gone out into the world, those who do not acknowledge Jesus Christ as coming in the flesh. This is the deceiver and the antichrist.
What true Christian would have an inkling support for an antichrist lie? Who is the father of all such lies, that will damn souls? It's no wonder Muslims do what they do,
John 8:44 You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand in the truth because there is no truth in him. Whenever he speaks a lie, he speaks from his own nature, for he is a liar and the father of lies.
The Bible is far from silent on what Islam really is, the only matter remaining is whether you believe God and the gospel, or not.