I heard of this, it's absolutely insane and hows how delusional all the anti-Jewish establishment is.
Rambam was no crypto-Jew. Last time I checked, it's Rambam who is hailed as the greatest sage in Judaism ever! Rambam's writings have no significance in the islamic religion nor is he on any fakestinian or arab cultural artifacts. If they want to claim him then maybe they should explain how the writings of a "moslim" man are about Judaism or how a moslim would write the Mishna Torah, 13 Principles of faith.
I mean come on, how many commentaries on the "hadith" did he write? 0!
Or they can explain how he made aliyah to Israel (even though he and his family left to Egypt a little afterwards) but it still counts!
It's ridiculous.