An infidel (literally "one without faith") is an English word meaning "one who doubts or rejects central tenets of a religion or has no religious beliefs", especially in reference to Christianity or Islam."Infidel", The American Heritage® Dictionary of the English Language, Fourth EditionCopyright © 2006 by Houghton Mifflin Company."Infidel", Random House Unabridged Dictionary, © Random House, Inc. 2006. "infidel." The American Herit