They also think that the biblical prophets, or at least the ones reported in the Tanakh were muslims as well.<quoted text>
Yeah, but there are probably a billion people who believe the same way as MUQ does. The implication of this line of belief is a sense of geographic entitlement. The world is screwed.
The strange thing is that we know about these prophets only from Tanakh that curiously have erased anything concerning the Islam doctrines. Hence they declare your book was corrupt.