Faith is a tricky word. For me, I have to bring Great Question to the word faith, because it's not, traditionally in Western religion when we think of faith, like faith in God, faith in some supernatural thing, or experience outside of ourselves.
Faith in Buddhism has nothing to do with anything outside of ourselves. It does not necessarily have to do with something supernatural or esoteric. In a sense, it's faith in our own true nature. It's faith in a sense that if I can be willing to let go of that certainty. And if I am willing to have the courage to meet the moment, something authentic, real and natural can emerge. Something that I may not understand. Something that may look nothing like I may expect. But there's a faith that if I just continue on, true nature will reveal itself. It's already present in all things. In the sense, you can say it's faith that using great question and great courage is enough. Not needing the certainty of an answer, but trusting the question.
By Zen Master Bon Soeng