I have noticed that some atheists equate religion with fairy stories.
I wonder if an atheist could explain why they use the term 'fairy story' in the perjorative and why they equate religion with fairy stories?
I'm not sure that I've ever compared religion to fairy stories - but perhaps I can give some insight as to why some may well do.
Firstly because neither fairy stories nor religion are evidence-based. There is no evidence that the claims in the fairy stories nor religions are true.
Secondly, while not having a scrap of evidence to support their fundamental veracity, both fairy stories and religion work on the basis of allegory, providing a moral or meaning that is to be taken away from the story. So although not actually true they provide value in societies to cement cultural and societal norms.
I also agree that comparing religion to fairy stories is often a pejorative approach (whether that is reasonable or not I leave to others), however you could just as easily equate religions to myths or fables, which also are typically not based on factual truth but provide a message.