Cady,
It looks like there are some small amounts of direct navigation type of opportunities for the domain name. Plus, I like the memorability of it.
I'd think it could run for mid to hi $xxx.xx, or even low $x,xxx.xx for the right buyer. If I were a religious zealot, it'd be worth the money. (We own a couple of theological domains as well and think they represent a good opportunity in this social climate.)
Just remember, another meaning for "people of Islam" is "Muslim", which may lead those who are interested in this domain to consider seeking out synonyms. However, I think the keyword "Islam" is great for SEO potential.