A fair (and quite dry) explanation of the case and the Grainger criteria
It is a lack of belief that everyone (incl me) has an inner gender identity, separate from and more important than our sex.
eg. being a vegan is a life-defining belief w cogency, seriousness etc... but liking bacon sandwiches can be just 'meh'.... still shldnt be discriminated for not believing 'meat is murder'
He says that employers should approach this conflict of rights issue with a large dollop of commonsense and compassion.
I think misses the point that irreconcilable circumstances in fact arise practically in situations *wherever* sex matters. (as covered by EqA fairplayforwomen.com/single-sex/)
But the belief i don't share says that is transphobic: we must accept ppl w fully intact male bodies in intimate ♀️ spaces.