Not just Muslim Africans. The Kongo Kingdom which was a Kingdom practicing a hybrid of Christianity adapted from Portuguese Catholicism, also had a culture of literacy restricted mostly to nobles. The area was a major source of slaves.
Considering the anarchy, chaos and infighting eventually caused by the slave trade, how possible was it for educated or literate Kongolese to end up in New World Slave plantations?
Also IMO I don't think there is really anything far-fetched about Muslim Africans or Africans from Muslim areas being taken to the New World. IMO early African American culture has a strong Sahel upper West African influence. But that's another topic I might make for another time.
Also this Muslim Prince from west Africa knew how to read an write in Arabic, he was taken as a slave to America and freed since he sent a letter in Arabic to Morocco and the Sultan asked for him to be released.
Abdulrahman Ibrahim Ibn Sori - Wikipedia, the free encyclopedia
Another African Muslim slave named Omar ibn Said was also literate in Arabic.
Highlights:
As early as 1441 the Portuguese captured some Africans from west Africa who could speak Arabic (since Arabic is not a native language of the people there, it it most likely that it was learned and that they must have been literate in it)
Africans in America/Part 1/Prince Henry the Navigator
It is likely that if any upper class African Muslims were sent as slaves to America that they had some knowledge of Arabic. There were Quranic schools teaching Classical Arabic in West Africa, especially in Timbuktu.