I agree, its really the form and practice where I see the similarites. The Koran is clearly a mish mash of Christian, Gnostic Christian And Gnostic Judaism literature.
There is a German historian who says the Koran is a misapplication through translating Syrian Christian liturgical literature in Syrian script (later adopted by the Arabs so thy could have a written language!)into Arabic then editing in other material. He says that if you take the Koran and read it in 6th century Syrian many of the grammatical & word usage problem go away.
Satan isn’t an originator. He is a robber. He steals truth and mixes it with his awful, but natural to him, lies. He is a fake and his products are fake. Nothing attracts like the truth. That is why he is compelled to use it, if only in part.