It's like religion. One of the things that always bothered me was that God's Word shouldn't fracture into all these thousands of sects and their disagreements and so on based on cryptic snippets written down eons ago. It should be like 2 x 2 = 4.
Such squabbling is the result of human nature, which seems to be naturally inclined to sectarianism. However, a number of philosophers and students of religion have pointed out the broad similarities that exist between the major religions, aka "the perennial philosophy".
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Also, my view is that the Divine seeks to reach us in the manner we are most receptive to in order for us to learn the essential truths. We'd need only one religion only if we were all interchangeable parts rather than distinct individuals. The Divine will even guide us towards atheism if that is the path that will best lead us to the truth.