The Family Of Imran - 3:20
"If they dispute with you, say, "I and those who follow me have submitted ourselves to Allah."Say to those who have been given the Book and those who have not been given the Book, "Have you submitted?"If they submit, they will find the truth. If they turn away, your duty is only to announce. Allah sees the servants."
The term "UMMI" does not mean "illiterate" but "one who has not read or been acquainted with the books that were revealed before".
The Cow/2:78
There are among them Ummahs among them who do not know the Book except by imagination and rumor, but they think that they know.
The Family Of Imran/3:20
"If they dispute with you, say, "I and those who follow me have submitted ourselves to Allah."Say to those who have been given the Book and those who have not been given the Book, "Have you submitted?"If they submit, they will find the truth. If they turn away, your duty is only to announce. Allah sees the servants."
The Heights/7:157
Indeed, they follow (when the time comes) that messenger whom they find written in the Torah and the Gospel with them, the Messenger of Allah, the Messenger of the Ummim (who has not read the Torah and the Gospel), who enjoins upon them good and forbids them from evil, who makes lawful for them good things and forbids for them unclean things, who removes from them the weights and the fetters that weigh them down. Those who believe in him and respect him and help him and follow the light sent down with him are the successful ones.
The Spider/29:48
You did not read any of the previous books, nor did you write them with your hand. In that case, there would have been a pretext for those who advocate falsehood to be suspicious.