Here is the thing. People abandoned religion not because it is 'irrational' but because of arrogance. Look at the present day - people are far from secular. They believe in all sorts of new age bs, astrology, self improvement narratives, visualisation techniques and the law of attraction. How is this more schientific? It's not, the real difference is that modern day 'spirituality' has the self as god. there isn't a creator, no god judges us... this is too inconvenient for the self - rather god is the mere universe that is supposed to serve the self without exceptions. god became a mere nature force under the command of human ego. This is why people believe in astrology, tarrot, crystals, political ideologies and what not - they worship the self.