Misunderstandings????? Man, you ain't just whistling Dixie!!! Misunderstandings, gaps, lacunae, distortions, misunderstood concepts, alterations, twists, inversions, diversions and PREversions enough to make a pore guy;s head spin!!
I have always been told that Allah was known to be the One God by the Muslims who is also worshipped by Christians and was referred to by Jesus.
But...given that I think most Terran "theology" is close to oxymoronic, I can't be held up as an expert!! Just in case you was gonna try that...