What I take on faith is that my experiences of the Divine are that, and not hallucination. Everything else can be explained everywhere from pure magic to pure psych/biopsych, but I take the Divine (not the experience of same, but the fact that what I experience is in fact Divine and not just in my head) on faith.
Some people have to take the experience itself on faith. Some people struggle to put a name to it. (I'd struggle if I tried. That's why I don't, not unless I am given a name to go with.)
And it doesn't feel like faith to me. It feels like certainty.