I can certainly say it disillusioned me! It's one thing to be unsure of something, and ignore the fact. Quite another to hear falsehoods coming from your own mouth. I always have a real hard time trying to convince someone of something I don't believe in myself. Otherwise I'd be employed in sales. Field service came to a grinding halt once I realized that my doubts were not being answered.
I kind of almost sort of did like conducting or sitting in on bible studies, though. Probably because the hard part of facing someone was done (and the knowledge you were going to count some real time). I remember I had a young (wise ass) student once who asked me what Jesus middle name was. Without skipping a beat, I replied "H."
No witness I ever told that to (including the bro who assisted me that day) ever found that humorous. I guess using the Lords name in vain was one of the few commandments most upheld.
Jesus H. Christ