We get sporadic questions from Islamic users that have very specific investing restrictions, because of their faith.
Those are good questions, and I welcome them into the site. I think a tag for these questions would be a good thing, to bind them together.
Maybe islamic-investment or islamic-banking, something in between.
Possible candidate questions for this tag (not exhaustive):
What are the alternatives to compound interest for a Muslim?
A country tag may not be recommended in this case, because Islam is present in almost all countries.