Both Uses

infidel
in
Oryx and Crake
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Jimmy could sometimes win at Kwiktime Osama though, as long as Crake played the Infidel side.†
p. 40.8

infidel = negative term for someone who does not believe in the "right" religion
Or, under pretence of doing their homework, which sometimes they really would do, they would shut themselves up in Crake's room, where they would play computer chess or Three-Dimensionals, or Kwiktime Osama, tossing to see who got Infidels.†
p. 77.2 *

infidels = negative term for people who do not believe in the "right" religion

Definitions:

(1) (infidel)
a negative term describing someone as not believing in the "right" religion or god
(2) (meaning too rare to warrant focus)