Nontheism is a term that covers a range of both religious and nonreligious attitudes characterized by the absence of — or the rejection of — theism or any belief in a personal god or gods. It is in use in the fields of Christian apologetics and general liberal theology. "Nontheism" should not be confused with "irreligion". Other, related, philosophical opinions about the existence of deity are ignosticism and skepticism. Because of variation of the term "god", it is understood that a person could be an atheist in terms of certain portrayals of gods, while remaining agnostic in terms of others.