There is a tradition of militant orders amongst many religions. With the Catholics, there were dozens (if not hundreds) of orders of knights, considered warrior priests. They did wear different robes, and they also wore armor when the occasion merited. There are also the Shaolin, a monastic order of monks who are very highly trained in martial arts.
The fundamental nature of religion is to enforce a certain reality, if necessary sending in the troops to get it done, and using intelligence groups to root out dissent, and if necessary burn it at the stake.
Where did that datum come from?
I certainly don't buy into it.