Because religions are a man-made thing and they are imperfect just as we human are. Then when you belong to a religion and you dont like one thing of it, you just make a new one or a sub-religion modified to fit your needs, basically the same you had, but with the removal of that thing you didnt like. Thats how I see it.
For example if Im in a religion where Im not allowed to drink alcohol, then I take all I like but I will allow followers to drink alcohol.
Joe
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