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I think a Muslim hoax is unlikely. Islamic doctrine teaches the perpetual virginity of Mary, she was "ever virgin".

Not that Islamic hoaxs, and contrived additions are altogether impossible. There is a document called the "Gospel of Barnabas", and scholars say that this is a medieval forgery, which either drew on Muslim sources or was the work of Muslims who wanted to create a pseudo-Christian narrative (Whatever for? But then, one could ask that of any fabrication.) IMO, there are also Islamic elements to some of the heresies and secret societies which came back to Europe after the Crusades. One example, is that the Templars allegedly denied that Jesus died on the cross. If (big if) they did indeed secretly teach this, they would have picked up the idea from the Qu'ran.

Muslims are aware of the divisions within Christianity - they could hardly not be, as one of the first things which Christian missionaries do when entering a Middle Eastern country is to traduce the existing Churches as non-Biblical. They don't need to do anything to foster these divisions, the Christians do it all for themselves.