Was it the first god/christ based religion?
Jehovah says: "This people approaches me with their mouth
And they honor me with their lips,
But their heart is far removed from me;
And their fear of me is based on commands of men that they have been taught.
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How you twist things! (or "How perverse of you!")
Should the potter be regarded the same as the clay?
- Isaiah 29:13,16a
The first religion of man is one that was approved by God in the Garden of Eden. Man has taken it upon himself to define reality by a different set of rules.
If any of us want to know the "form of worship (or "religion.") that is clean and undefiled from the standpoint of our God and Father," (Jas 1:27) we need to remember that only God has to the right to dictate what he approves of. My personal studies have convinced me that the 66 books we have currently are truly the true God's written word.
Some religions that claim Christianity devalue the Bible by calling much of it myth, or internally schismed. Or they have their own traditions/writings that supersede it.
It is my conviction that this approach to understanding is backwards. If the Bible (all 66 books) seems to contradict itself, then it is our understanding of it that is still flawed.
We need to dig deeper and/or find teachers that already show evidence that they are really living and adjusting to line up with the Bible itself.
Then we can "come to an accurate knowledge of the truth." - 1 Timothy 2:4