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There is no such thing as “pure undefiled Religion.”
Do you mean pure undefiled faith?
Religion is by definition the invention of men, not God.
In Yeshua’s letters to the asian churches, he offers palpable praise only to the church of Philadelphia. All of the others get some level of chastsement.
By this passage one gets the idea that perhaps only 1/7th of those who believe they are on track really are.
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See James 1:27.