Regarding the first claim, it results from a myopic view by focusing only on the similarities.
Sure there are elements of truth or similarities, but to deny the aspects where the religions differ and are even in conflict with each other?
As @bhupatiranga had once said, there are various subjective approaxhes to Truth, but these approaches can become sources of conflict themselves.
That is what happens when you integrate closely your approach to truth to all aspects of tribal organization.
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