Disbeliever

An infidel is a person who is accused of disbelief in the central tenets of one's own religion, such as members of another religion, or irreligious people. Infidel is an ecclesiastical term in Christianity around which the Church developed a body of theology that deals with the concept of infidelity, which makes a clear differentiation between those who were baptized and followed the teachings of the Church versus those who are outside the faith. Christians used the term infidel to describe those perceived as the enemies of Christianity.