Some more on that...
DN 21
Then Sakka, having delighted in & expressed his approval of the Blessed One's words, asked him a further question: "Dear sir, do all priests & contemplatives teach the same doctrine, adhere to the same precepts, desire the same thing, aim at the same goal?"
"No, deva-king, not all priests & contemplatives teach the same doctrine, adhere to the same precepts, desire the same thing, aim at the same goal."
"Why, dear sir, don't all priests & contemplatives teach the same doctrine, adhere to the same precepts, desire the same thing, aim at the same goal?"
"The world is made up of many properties, various properties. Because of the many & various properties in the world, then whichever property living beings get fixated on, they become entrenched & latch onto it, saying, 'Only this is true; anything else is worthless.' This is why not all priests & contemplatives teach the same doctrine, adhere to the same precepts, desire the same thing, aim at the same goal."
The above passage puts a wrench in both the extreme views, "All religions are basically just the same," but also, "My religion and my religion alone is the truth!"
Also:
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There must be the ability to review and leave out, or at least mollify, exclusivist and rigid positions, which in conflict discourse appear in the guise of unnegotiable conditions.
Clinging tenaciously to opinions, holding that this alone is the truth (30) has been repeatedly shown in the Theravada canon as a reason for conflicts among people. Emotional attachment to dogmatic views .. disrupts the harmony of social relations and brings about results which are socially harmful. (Premasiri: 18). The abandonment (pahana(31)) of such attitudes is hailed as a sign of a developed mind or of maturity of character.
There cannot be peace as long as people that is to say the various contending parties - remain irrevocably fixated on divisive and exclusive conceptions of nationality, creed, language, culture and territory.
...And as has been mentioned many, many times before... Asoka the Great's wonderful, wonderful words:
Growth in essentials can be done in different ways, but all of them have as their root restraint in speech, that is, not praising one's own religion, or condemning the religion of others without good cause. And if there is cause for criticism, it should be done in a mild way. But it is better to honor other religions for this reason. By so doing, one's own religion benefits, and so do other religions, while doing otherwise harms one's own religion and the religions of others. Whoever praises his own religion, due to excessive devotion, and condemns others with the thought "Let me glorify my own religion," only harms his own religion. Therefore contact (between religions) is good.[24] One should listen to and respect the doctrines professed by others.