Answer:
Buddhism does not require faith in any tenets. Buddhism requires that you study it enough to understand what's being said, then (if any faith at all is required) that you try it in your own life and see if it works. Buddhism is built on direct experience, and with that experience comes improved understanding of the way things really work. Once you have improved understanding, your life goes more smoothly, so you have evidence that this new view of things is beneficial.
We sometimes see the word "faith" used in translations of what the Buddha taught, and it usually is stated there as having faith in the Buddha, the Dharma (the teachings), and the Sangha (the community of followers). But here again, this is not about faith in the tenets of Buddhism. This sort of faith is required when one begins to practice, and finds the practice is darned hard work. (Buddhism does require serious effort.) This is when faith in the Buddha, his teachings, and those who also practice can help. But you know what's funny about that? I don't think it's really faith in Buddha, dharma, sangha that you're exercising there so much as faith in yourself -- that you can do the work.