It's everyone else fault.

Let's make a quick check on the list between religions that has problems vs peaceful relations with each other.

Buddhism:

Peaceful - Catholic, Protestant, Hinduism, Judaism, Shinto, Zoroastrianism, Paganism, Spiritualism.  (China, Japan, India, Philippines etc.)

Hostile - Islam. (Malaysia, Burma, India, Pakistan.)

Islam:

Peaceful -

Hostile - Islam, Catholic, Protestant, Hinduism, Judaism, Shinto, Zoroastrianism, Paganism, Spiritualism. (Malaysia, Burma, India, Pakistan, Azerbaijan, Syria, Iraq, Egypt, Niger, Nigeria, Albania, Greece, Italy, Austria, Germany, France, England, Sweden, USA, etc.)

I think there's a pattern here. Can't quite make it out though.