Great thread PE!
Yes, your father, and so many other old timers would not even recognise this religion anymore!
If they were "resurrected" back now, they would think it was a completely different religion! Certainly not "the truth"!
For those old timers still in - it is a case of "frog in boiling water" analogy. They dont recognise the changes occurring as they are right in the midst of it as it gradually morphs into something new...