Salam if he just has had "mythical visions and dreams from Allah " so then others could have these visions too likewise people who have NDE experiences so therefor if prophet (pbu) has fabricated his vision so then other people could do it in similar fashion of him which it would result to writing new Qurans & creating new IslamsĀ  in similar fashion of creating cults by frauds . If you believe that Islam is best faith but it's fundamental book has mistakes it will be paradoxical which