EvC Forum: Identifying false religions.
I would have thought that the point was that it is simply not possible because it relies on a subjective judgement of real and fake. There is no empirical yardstick available to measure validity in matters of faith. Indeed faith is belief without or even inspite of evidence, so it follows that no religious faith can be validated or classified as 'genuine' or 'fake', because evidence is not an accepted measure and any other measure is inevitably subjective or arbitrary or both.
Religion is inherently non-rational or irrational and to attempt to apply a rational measure of validity to such is a category error. Any non-rational measure is, by definition, not subject to validation.