Many believers use Faithism (Fideism) Their faith-ism is evident in how they think faith is evidence.
However, faith its belief without evidence or as its defined in the dictionary:
“Faith is a firm belief in something for which there is no proof.”
Faithism in philosophy is called, “Fideism.”
Fideism holds or appears to hold that reason is unnecessary and inappropriate for the exercise and justification of religious belief. The term itself derives from fides, the Latin word for faith, and can be rendered literally as faith-ism. “Fideism” is denoting a particular philosophical account of faith's believed authority over that of reason.
A fideist someone using Faithism is one who “urges reliance on faith rather than reason, in matters philosophical and religious” and who “may go on to disparage and denigrate reason” . Notice, first, that what the fideist seeks, according to this account, is truth. Fideism claims that truths of a certain kind can be grasped only by foregoing rational inquiry and relying solely on faith. Insofar as fideism insists that knowledge of these truths is possible, it must be distinguished from various forms of skepticism with which it otherwise shares certain common features. Notice too that this definition is largely formal; the plausibility of fideism as a philosophical doctrine and the proper extension of the term will therefore depend on the content given to the terms “faith” and “reason.” Fideism is a separation from rational thinking thus involves thinking blindness, which can be labeled “Blind Faith.”