Original sentence: In Islam, the Arabic word kafir (كافر) refers to non-believers, often in a derogatory sense , and is usually translated into English as "infidel" or "non-believer".It should be noted that heretic (one who falls astray from true doctrine) and infidel (one who does not believe doctrine at all) may not necessarily hold the same meaning
Edited sentence: In Islam, the Arabic word kafir (كافر) refers to non-Muslims, frequently with a derogatory sense , and is usually translated into English as "infidel" or "unbeliever".The only world religion that used infidel as an exact translation of non believer is Islam.To say Heretic (one who falls astray from true doctrine) and Infidel (one who does not believe doctrine at all) are the same word is absurd