This describes Christianity (to an extent). When I turned atheist (because I couldn’t believe in God/Jesus anymore, not because I didn’t want to) there is this very Church-shaped hole in your proverbial soul that needs time to close. It’s a very sobering, yet lonely, way to live life, but due to the internet you don’t find yourself lonely for too long, but I imagine it used to be a pretty terrifying way to live life pre-internet.

I am lucky my Christian family still loves me, and I know they only proselytize to me (every now and then) because they care.