Yeah, of course you have to complete the FB89 sage or demon culti.....
it says on celestial schism mold that you will need to finish all your spiritual quests to use it even if you used third culti fairy(skipped 99 109 culti quests) . never done it myself, since its easier to just create a new char. hi xaida
I'm not sure if it was a glitch, but I successfully switched my sin's culti from sage to demon; without completing the full culti. :x