I don’t know for sure. I usually only get once chance then they don’t come by for a few years, one set even passed by our house on the opposite side of the street.
However, I have shaken some of them up, especially the new ones. I counter everything they say with the Bible, and when they fall back on their testimony I counter with mine, using similar phrases and beliefs.
Sometimes all we can do is plant seeds.
As i was reading your post, i was thinking all we can do is plant seeds, we need the Holy Spirit to move someone with the gift of faith. you ended with the same phrase, showing great minds think alike!!