Something which is not real or exists only in someones imagination.
Examples:
santa claus
the tooth fairy
Easter bunny god
heaven
hell The bible and other storybooks.
Everyone knows god is fiction but many are too big-headed to admit they are wrong.
Fictious character who some people believe is a magic man who can make magic and they usually waste half their life praying to it. Many of these people have been brainwashed by the bible.