Isn’t this game supposed to be 1500 years after the 1300’s Mali got transported to the planet? So they’re living in the 2800’s.
What the historical Mali’s did or didn’t do probably wouldn’t even be in their history.
Not necessarily. Today's Islam is still recognizably the same faith Mohammed al-Quraysh laid down in the seventh century, which is unsurprising as the Qu'ran (identified as the final and most perfect revelation) explicitly forbids alterations or additions to its own text.
It's certainly easy enough to speculate that new
hadiths (schools of jurisprudence and legal interpretation) could and would arise, or even entirely new sub-traditions like the Sufis. But any suggestion that radically reinvented the faith to the degree this setting sounds like it wants would be just as much an "erasure" as the fantasy series written a while ago (I've unfortunately forgotten the title and author) which assumed the absence of the North American indigenous peoples in its plotline.