Anekantavada
Recently finding Jainism to rank high among my Belief-o-matic matches, I decided to look into it, embarrassed by how little I know about the subject. Had visited a Jain temple on my first day in India many years ago, and knew about their ahimsa doctrine and practice. It made them seem extremist, going beyond vegetarianism to forego even root vegetables because digging them up might harm insects in the soil. Likewise, wearing a mask to avoid inhaling small bugs and carrying a broom to gently sweep the path before you seemed awfully extreme. But if a religion is going to be extremist about anything, harmlessness to all living beings seems like a good choice. After ahimsa, though, comes the principle of anekantavada which seems best translated as pluralism or relativism, a rejection of "my truth is better than yours" that may be unique among major religions. The Harvard Pluralism project website offers this on the doctrine. Excerpt:
Interestingly, Jainism is the most unambiguously atheistic of the world religions, and yet also the most pluralistic and tolerant. A little known (in the West) faith tradition from which both theists and atheists might learn something about respect and openness.