The Abrahamic God is worshipped by Jews, Christians and Muslims. It doesn't matter that some Christians dispute that, that's what Muslims believe (their holy book, for example, recognizes Jesus Christ although, obviously, not in the same way that Christians do).
Different dogmas, same God. Folks disagree, and even kill each other, in the name of those dogmas. And the same God in Heaven is no doubt weeping at the destruction caused by religious tribalism in His name.