I am very hesitant to call any religion or ideology, or state or ethnic group, an "X of peace". (whatever X stands for). Or indeed an X of war. Or of justice. Or of anything really.
I honestly could not tell you what a useful definition of "religion of peace" would be. A religion that can only be interpreted in one way, and that one way is peaceful? Well, that *might* perhaps go for Jainism, but starting with buddhism, and way more with the monotheistic religions, this is just obviously not the case, people have fought wars in the name of their respective religion. So we could divide between "true" interpretations and false ones. But then, if we don't just *define* that true === peacful beforehand, how would we know which one is true? Is postmodern christianity truer than medieval christianity? Was Islam in its golden age truer than what is taught today? I could not tell you.
Worldviews are necessarily full of flaws. They have their glorious parts, their not so great ones, and they also contain absolutely abysmal, idiotic, cruel or simply weird bits. (That's precisely why I don't advocate believing in a worldview. It is always better to evaluate every single claim and try to find out what one really thinks is true, not what feels good.) So you cannot have a "religion of peace". Just religions that are comparatively more peaceful, or less cruel, than others.