So. Basically it's a cult of a specific breed of bunnies, known as only the 'Biblically Inaccurate Bunny.' Or, BIBs for short!
They are very round, fluffy, bouncey, and basically indestructible creatures.
They all also are themed after something. For example, Crop BIB:
Again, all BIBs are in the BIB cult. Their leader is Bakery the breakfast BIB:
And all the BIBs worship their God, Biblically accurate inaccurate bunny:
These bunnies have the intelligence of humans, but only high ranking priests in the cult are able to speak.
If you've PLEASED the god, you might be 'Blessed' with a BIB that was created in the image of something/someone you like.
The BIB God also has every single human and or monster have a BIB variation. Meaning for every single undertale AU, there is a Bible equivalent canonical to the BIBverse.
Sooo yeah.
One day I'll draw out all the bad Sanses as BIBs, but for now, here's who I have:
Another thing is their BIB version have design elements incorporated into them, rather than a direct copy of their monster/human counterparts!
Also. They tend to have a superiority complex, and consider it VERY offensive to be called just 'A bunny' Or bunny, rabbit, hare, or any other breed that isn't BIB or Biblically inaccurate bunny! ^^