An incorrect belief system, which unlike Descartes' "I think, therefore I am" states "I believe, therefore it is." In other words, a fideist believes that belief forms reality. Seen in the New Age Movement and in the Word Faith Movement.
The traditional doctrine which holds that all our knowledge must begin with an act of faith in divine revelation, since human reason is impotent to arrive at any certitude regarding the fundamental truths necessary for man to know; also, the doctrine that such truths can be known only by an affective act of faith.
The view that truth in religion is ultimately based on faith rather than on reasoning or evidence. Influenced by Kierkegaard's existentialism and presented most notably this century by neo-orthodox theologians. Recent forms of fideism are attempts to assert that the fundamental tenents of religion cannot be justified by rational argument or by empirical evidence.
In Christian theology, fideism is any of several belief systems which hold, on various grounds, that reason is irrelevant to religious faith. According to some versions of fideism, reason is the antithesis of faith; according to others, faith is prior to or beyond reason, and therefore is unable to be proven or disproven by it.