What of those that also believe they have no free-will and that choice is inevitably determined by immediate environmental circumstances?
Their intersubjectivity, collectivized perspectives, are how they decide what has been determined for them to believe.
The circumstantial agreement by a majority becomes evidence that they could not have ever believed otherwise.
God's will replaced by humanity's collective will.
This is how they 'know' they are on the 'correct path' and that their choices are the ones they could have ever made.
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γνῶθι σεαυτόν
μηδέν άγαν