Okay. But they list named prophets. They’re all of one people. Sure, they might believe any number of un-named prophets may have gone to any number of un-named peoples, but the fact they’re not named seems to me to be a matter of their insignificance, because, after all, their message doesn’t affect us - not in any observable way.
So you’ve got a list of known prophets from Adam through to Jesus. They all belong to a single line -granted that Adam is ancestor of all, but there’s a direct line from Adam through to Jesus insofar as that line consists of the rise of the people we know as Jews.
And Moslems are supposed to respect these - but I’m unaware, for instance of Moses giving his message to the Arabs. So why do they get Muhammad out of this line. There’s no (for want of a better word) pedigree.
I’m sorry if I’ve not explained this better. But, any other ‘covenant’ to others seems irrelevant and outside of this specific line.
So, in short, no Moslem’s been able to tell me why God switches to another people.