Well, I can see a path for it. Let’s say you are a millenials who knows the difference between good and evil. You would rather have a life filled with productive challenges pursuing goals in the “real world” but there are no jobs. You know why there are no jobs. You fill your time “battling evil” in video games. You get involved in an online crusade to bring down a corrupt politician. You see miracles unfold in front of you. You begin to realize that grandpa maybe DID have a clue after all...
Perhaps in your example, the grandfather is the catalyst, not KEK.
Romans 10:
14 How then will they call on Him in whom they have not believed? How will they believe in Him whom they have not heard? And how will they hear without a preacher? 15 How will they preach unless they are sent? Just as it is written, “How beautiful are the feet of those who bring good news of good things!”