Only 3 simple reasons -
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One doesn’t need to beg the God here for material gains or worldly pleasures. They come automatically. In other religions one has to pray and please their god for some unknown time before he decides to do something favorable to such a devotee.
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The devotee never remains a devotee forever. He attains the level of the God he worships and becomes a God himself. In other religions, the devotee has to become a slave to some entity who is full of attachment, hatred and delusion and doesn’t allow the devotee to become same as him.
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Comparison of religious principles with other religions convinces me that Jain religion is still super advanced for its time and the world would have been a good place to live had all its inhabitants been following Jainism.