I'm sure I don't need to give you instructions on how to use google, do I? Maybe Michael Medved can give you those instructions (if someone else wrote them first). There is plenty of literature on it, and I doubt "you'd all know." Because it's well known that he likely did, and you don't know that. Your precious Medved must not have said it for you to then regurgitate.
In other words, NO, you have no sources for the fallacy that Rambam converted to islam. Nice try, though.