In research of Muslim theologians & contemporary philosophers about knowing of God, there are some similar approaches which their Studying & analysis is necessary in comparative review. There are various philosophical & theological ways in proving existence of God, such as; (1) emphasis of Ibne Sina & Mull Sadra on just one proof for proving of God, (2) believe in God based on plural arguments that offered from Fakhr Razi & Richard Swinburne, and subsequently (3) Alvin Plantinga’s proving based on basic view. By acceptance of plurality of arguments, Fakhr Razi offers functional explanation in his works: 1) certainty is function of plurality, in addition, 2) composure and modesty of thought are bringing from plurality of arguments too. The first function is resulted of certain arguments & the second one, of persuasive. Richard Swinburne has also taken this pattern, that is, plurality of arguments or cumulative arguments; however, he considers criticisms approach. According to Swinburne point of view, plural arguments make existence of God more probability. Therefore, both scholars with classification of proofs have considered plurality of arguments and have presented functional explanation. But there are some differences between theirs views: 1) certainty has been accepted in Fakhr Razi’ s view as function of plurality of arguments, but, Swinburne emphasizes in more possibility, 2) the ways of accepting of arguments and criticisms of them; 3) finally they are different in description and sides of explanation.