@Franklin Massey
I used to study with a guy who was 35 years my senior and his wife. I became extremely good friends with them, to the point of enjoying several meals together, going out for a beer with them, and meeting their family members.
It has been one of the best and most meaningful friendships I've ever had. I personally felt like a dirtbag that I had this hidden motive every time we were together, so I eventually phased religion out of the equation, and just tried to be a good friend. I learned way more from the two of them about life and faith than I could have ever taught them myself.
It began to bother me that the rest of the people in my congregation would likely have written them off as a lost cause, because their interest in the truth began to wane. I could never imagine God killing them at Armageddon because at 60 years old some 25 year old couldn't convince them to become Jehovah's Witnesses.
Unfortunately, the two of them moved away, and we are only in touch via email. He is in town visiting family in September and I am meeting up with him for dinner. I have considered expressing my new-found reality with him, and apologizing that our friendship started with a shady premise. I think it might be a little too akward though, so I might just enjoy his company and leave it alone.