Aristotle included faith as one of the three sources of knowledge. I present a detailed description of these three sources in Book One and The Foundation of Belief in The Cabana Chronicles series of books on comparative religion and apologetics. While I agree with Aristotle (normally that’s a smart thing to do), I believe faith is much more than just another source of knowledge like tradition and reason.
We Christians rely on our God-given faith to believe the Bible is His Word. In this way, faith acts as our source of knowledge. But our biblical faith is trust based on knowledge supported by reason because the Bible provides us with the evidence for our belief. You could say that our faith is based on knowledge grounded in evidence. Atheists dispute our claim and, as Mark Twain once said, “Faith is believing in something you know ain’t true.”
Author Greg Koukl says that “Given the clear teaching of Scripture, it’s astonishing that some atheists mischaracterize the relationship between faith and knowledge. For example, philosopher Peter Boghossian defines faith as “pretending to know what you don’t know” in his book A Manual for Creating Atheists. For Boghossian—and many other so-called “street epistemologists”—faith is a way of knowing. In philosophy, this is called epistemology.
However, faith is not an epistemology. Responding to Boghossian in his weekly podcast, Reasonable Faith, philosopher William Lane Craig said,
This is so fundamental. This is a watershed. He [Boghossian] says that faith is an unreliable epistemology. He wants to make faith an epistemological category instead of a moral virtue. It is right there that we need to dig in our heels and say this is a misunderstanding of faith. Faith is not an epistemological category…. Faith is a way of trusting something. Faith is trusting in that which you have reason to believe is true. So it is once you have come to believe that something is true using reliable epistemological means that you can then place your faith or trust in that thing. To do so is a virtue.
So faith and knowledge are connected, but they are not the same thing. They are in completely different categories. Faith is not a way of knowing. Rather, faith is a way of trusting in what you know to be true.”