First and foremost, not all cults are negative. From that point we can have the scale be cult specific.
Negative Cult(-1) - Benign Cult (0) - Positive Cult (+1)
The opposite I would assume would be non spiritual groups of people who connect in another way outside of something “spiritual”, without a set standard for beliefs provided by a singular leader required to be member to the group.
Negative Group(-1) - Benign Group (0) - Positive Group(+1)
Shout out to Theta making it in as a character.