You could say that people would find another reason for conflict, and before theologically intolerant religions arose, they largely did…

… but that doesn’t mean that religion, even pluralist religion, isn’t harmful. Religion is a very ‘easy’ tribe to ‘lock in’ to, as it rejects any notion of proof or dispute with the divine, which cultivates attitudes that are both dangerous intransigent and frighteningly fanciful. While religions may cultivate these attitudes to different degrees, almost all religion encourages them to some degree.