The perfect religion for those who aren't sure if they really believe in a god, but don't want to risk the big red one. Based on being as good as you can be, but not going over the top and showing up the others, the religion of the not-necessarily-religious doesn't believe in rules as such, at least not written ones. Therefore there are no commandments, but believers are asked to be nice to people and to really try and not steal things or kill people, if they can really help it. Attendance at a church is by no means compulsory, or even advised, but a number of popular pilgrimages exist, such as the centre of the civilised world, Home Bargains.
"Hey Josh, wanna come pray to God with me and my good buddies?"
"Nah, I'm one of the not-necessarily-religious."
"Oh. I didn't know you were, uh, 'like that'."
"What the hell does that mean? Son of a bitch!"
"Ah, no! My splean!"