Islam is the deception of Satan, and Islamics are mistaken about who their god actually is because they are deceived by Satan and his disciple Mohammed.
The God of Abraham is the Father of our Lord Jesus Christ and all of those who place their faith in Him. Allah is NOT Jehovah God of the Judeo-Christian bible, he is a fallen angel masquerading as deity who has deceived billions of Muslims into believing that he is the same deity who Abraham worshiped.
God promised Abraham that he would make his illegitimate son Ishmael into a great tribe, and he did. But he did NOT say said that Ishmael or his progeny would worship Jehovah, and they don't. All of God's promises to Israel and the Church are given in the bible by divine inspiration. Any honest and impartial reader of the Koran will soon realize and admit that it was not inspired by a good and holy deity.
Reality is not important when it comes to belief. It is important to know what they believe. They may believe that their god is a little green man who jumps from mushroom to mushroom. Knowing what they believe gives us power.
The God of Abraham is the Father of our Lord Jesus Christ and all of those who place their faith in Him.
So all of those Millions and millions of Christians who believe that the God of Abraham is Christ are wrong? Or maybe it's the Jews who wrote The Book who are wrong?
Religion is just the cloak they use. Do you understand?