This, even in recent times, is apparent with the Holy Pope making appalling comments against the Buddhists. This itself is a most intolerant view, with the admission that it is not crude and barbaric as Islam. However, to the best of my knowledge, Christian missionaries who wanted convert the whole world, were more clever behaviorially by their tolerant and tenacious attitude. This of course was greatly assisted by the forgiving messages in Christ's teachings. What you have just written, is not at all surprising to me.
Monotheism is itself a concept that can be challenged on a metaphysical basis.