how to create new stat value that effects rely?

[tahltwo]

.
i want to create a "divine rank" value.

this value will be used to calculate certain effects.

e.g.
- divine rank: 3 gives attack bonus +3
- a feat has prereq for divine rank: 5
- gain dr 5 / magic per divine rank
- absorb 10 damage per divine rank
etc

is there something existing that i can use to reverse engineer without creating new scripts? (which i am not proficient)

thx