I don't quite understand why people put so much time and effort into conversing

I don't quite understand why people put so much time and effort into conversing

I don't quite understand why people put so much time and effort into conversing with other people about their internal "belief systems." To me, the only thing that really matters is how other people behave: whatever they believe is secondary to how well or how poorly they act. If one person believes "treat others well because Jesus says so," while another person believes "treat others well because Krishna says so," wouldn't they then both agree with each other that the over-riding priority here is to treat others well? How much "should" it really matter WHO says so?

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