Sometimes it's dubious to trust those historical sources. Often times groups at that point would consider even other Christians to be 'Atheists' because they didn't believe in the right god. Although it's entirely possible lots of tribes have been Atheist. We just don't have great records of many of them and early Christian sources are very biased and very unreliable. I mean in that letter they are explaining the beliefs of people they can't even talk to.
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