Ockham's razor thougt by believers

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Following is from http://www.iep.utm.edu/ockham/

"Ockham’s Razor is the principle of parsimony or simplicity according to which the simpler theory is more likely to be true. Ockham did not invent this principle; it is found in Aristotle, Aquinas, and other philosophers Ockham read. Nor did he call the principle a “razor.” In fact, the first known use of the term “Occam’s razor” occurs in 1852 in the work of the British mathematician William Rowan Hamilton. Although Ockham never even makes an argument for the validity of the principle, he uses it in many striking ways, and this is how it became associated with him."

Ockham himself was Franciscan and fideist.