Going by history id say Buddhism.
No religions unblemished but Buddhism probably has the lowest kill count.
Not Hinduism, or judaism bloods been spilt in there name a good bit.
Islam and christianity have the bloodiest history and more killed in there name than all the others and at one point both advocated violence as a means of spreading so its definitely neither of them.
I barely heard of jainisium so i cant say i no enough to comment on it.
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I can't say you are wrong. On the other hand we can't just look to everything's past mistakes. I agree Islam and Christianity are coated with wrong doings. In current times however, both religions (excluding radicals) are trying to promote peace and tolerance. Unfortunately in times like these there will always be people who use religion for power, war, and money.
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I don't recall Buddhism being a religion for it doesn't demand faith from its 'followers'.