Don't be scared by the page title. This is not a Geometry lesson.
However, I have observed there are a few mathematical properties in everyone's "theologies," including in mine as well.
Here's an example: the postulate. If you have studied Geometry, you know that a postulate is something we consider true and doesn't need to be proven to be true, unlike a theorem. Something along those lines, at least.
"How does all that postulate talk apply to my theology?" Well, I believe I can compare the postulate to the assumption where my worldview is rooted.
The fact is: as I develop my worldview from my initial assumption, the assumption itself becomes something that I take as granted (because I keep assuming it is true). I may question the veracity of my assumption sometimes, but my perspective - the way I see things - has gradually become so deeply established in that assumption that it feels absurd to change it. That happens with me, with you, and with everyone in the world!
"Wait, wait - everyone!?"
Yes, since everyone needs to assume something is true to be able to deem what part of all else is true and what part is not. Even an agnostic, "one who asserts that all claims to knowledge are uncertain", holds an assumption (which is, basically, the definition of the word "agnostic"). The agnostic builds his point of view and his whole worldview from simply assuming that nothing can be known for certain.
Dear reader, you may say whatever you want about what I'm about to write. The assumption is a leap of faith. You cannot prove it or disprove it. Trying to do so is like playing a soccer match without a ball. All you can do to begin with is assume.
Example: An atheist assumes there is no God. Can he prove it? I don't think so. He may able to explain how things seem to work without a God, as much of science has done, but at the end of the day he still does not have the evidence to prove the whole world "there is no God." Can I disprove him? I don't think so either because I have the same "problem."
I believe the Bible is true. You can come to me and say: "the Bible is nothing but a bunch of fairytales and lullabies," but I can say all the Bible is inspired by God. Could the Bible actually be just a bunch of fairytales and lullabies penned a long long time ago? Of course it could! But I don't believe so! Why? Because I assume all facts and knowledge in the Bible are true! Is the Bible fully inspired by God? I believe so. Can I prove it? Nope.
And there's nothing wrong with having faith, even if you have faith in something that goes against faith itself.