The Narrator said
In that case all our characters would have to be black.I think we should use a own new, post-war movement.
It's a possible faction within wherever this RP would be, and historical and culturally relevant to the atmosphere Fallout has set up for itself. Doesn't mean the whole RP is by default based around the NOI. Another movement could in fact arise in reaction to the NOI's continued existence, or even being forced to share a vault, or neighboring vaults: whichever would work and not immediately spell the death of both sides from inter-Vault conflict or diffuse the situation with just having to sit around together for roughly a hundred years or more.
There's a number of Muslim or Muslim-related movements already that had relocated to the US, or are now in a larger state of operation here than where they once were. Like the
Ahmadiyya (
Alternate, more full link).
As a whole though, many were a part of the black Civil-Rights movement in America. So if there's is going to be Islam tossed into Fallout as the serious topic of the plot, it might by default entail some sort of racial question.