Too bad you asked, because you played into Secondhand Lion’s hand. (Paw?) It looks to me like he deliberately chose a word that, if you squint, could be taken as a scientific word for faith. The problem, Secondhand Lion, is that you’re misrepresenting what the word means. “To postulate” generally means you’re taking a particular concept as a given so you can explore its implications or as something that has to be true in order for other things to be true. The second definition makes that clearer, and so does the noun form, which you didn’t quote in the first place. Here are two Dopers using “postulate” as it’s actually intended:
And why is “postulate” the word you’re focused on? Why not “hypothesize:”
Nothing about faith in there. Or theorize: