Within each of the great religions there is a well established doxastic practice (DP) of taking experiential inputs consisting of apparent direct perceptions of God (M experiences) as giving prima facie justification, subject to defeat by overriders supplied by that religion, for belief outputs that God exists and is as he presents himself. (This DP is abbreviated as "MP.") William Alston's primary aim in his excellent book, Perceiving God, is to establish that we have epistemic justification for believing that MPs are reliable in that for the most part their belief outputs are true and moreover true of an objective or experience independent reality, unlike the belief outputs of the DPs based on sensations and feelings, along with the introspective DP whose intentional accusatives, although existing independently of being introspected, fail to be objective because they are themselves conscious states.