Hi PS,

             I was one of those who 'drifted' rather than 'dripped' and only confronted the 'cultism' when faced with, what was for me,  a much bigger set of personal challenges.

Like others who have responded I'm dubious about whether 'drips' can be prompted by any outside agency - from what others have described these small  changes in perception are functions of the individual psyche and probably develope out very subtle progressions over many years.

Relationships are frequently problematic and it is almost impossible to give sensible advice without having some direct involvement with the people concerned.  For what it's worth my opinion is that your partner will never change his comfortable 'cult' attitude unless presented with some serious challenge from outside - a 'wake up call' of some sort. Perhaps a 'gentle' way for you help that process along is to do as others have suggested and (if your partner will comply) get some couple counselling,  which might provide an environment where you partner can not so easily hide from the distress his cultism causes you.

Good Luck

Nik