Looks like the definition of the word is OK to use in the context it's being used here so, I wouldn't exactly call it silly. I know Damon would because if your words aren't a parrot of his thoughts, he assumes you silly. Man oh man, sometimes it must be hard being perfect
infidel (IN fi duhl, IN fi del")
1. A person who does not believe in a religion
which another person regards as the true religion: "Even in modern
times, we hear about someone who condemns another person of being an
infidel."
OR
The Oxford English Dictionary lists several definitions for infidel,
all of which have many attributed historical usages. It would appear
the modern use of infidel did originate from English-speakers, but in
reference to non-believers in Christianity, including "Mohammedans" and
"Saracens."
These usages are from the first definition: one who does not believe
(what the speaker holds to be) the true religion; an unbeliever
- Tyndale, 2 Cor. VI:15, (1526): "what parte hath he that beleveth with an infidele"
- Tim. v.8: (no date) "the same denyeth the fayth and is worsse than an infydell"
These usages are from the second definition: an adherent of a religion
opposed to Christianity, especially a Mohammedan or Saracen:
- Malory, Arthur (1470-1485): "two honored Saracens who are infydeles"
- Fabyan, Chron. (1494): "if any thyge be done to honoure of the Cristen, and reproche of infydelys it is most lykely to be done by vs."
- Hall, Chron., "infideles and unchristened peoples"
- The Book of Common Prayer (1548-1549): "have mercy upon all jewes, turkes, infidels, and heretikes"
- Shakespeare, The Merchant of Venice (1595): "Daniel, Jew, now Infidell, I haue thee on the hip"
There is much more information in the OED, but no mention of when Muslims first used it to refer to non-Muslims.