Preset conceptions of any sort are not discovered under a bush. So in that respect the devout wish to be their own God / Authority, too. Via their ideological ancestors formulating such a prescription for operation and a scheme of interpretation (which sports items like "unbelievers are unrepentant sinners").
A brain does come with preset conditions established by an evolutionary history which make its manner of representing and understanding the world possible. But most of the special affairs of human civilization are invented or gradually developed, diverse add-ons passed down by tradition. Which continue to be gradually modified in that creative process.
While it is certainly within natural character for humans of a particular clan or group to have commitment to their preset customs and identity... Each in cooperative conjunction with the others still also has an obligation to devise or recruit mediating systems of ideas that allow their differing worldviews to co-exist peaceably with each other. A common tenet in any of those negotiating "bridges" should be that of "staying within one's own turf" when it comes to application of rules pertaining to the functions and judgements of a specific tribe's own plan of psychological apprehension and behavioral operation.
Defense in response to unprovoked attack or ensuing warfare between ideological camps can be a potential exception. But the point is to forge an intermediating apparatus or philosophy between what initially seem to be incommensurable schools of thought, so as to diminish or outright eliminate the frequency of such hostile occurrences.