This is one that bothers me, as a grammar Nazi.
  • Islam (n) - a religion whose deity is Allah; also the civilization centered around the Islamic faith
  • Islamic (adj) - of or relating to Islam
  • Muslim (n) - a person who is an adherent of Islam
Sorry to bring it up, but everybody seems to misuse the terms. Probably because even journalists get it wrong, who we (at least used to) acknowledge as excellent grammarians.
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Bitt Faulk