He knows I don't agree with mormonism. He knows I do agree with free choice. He complimented me and I accepted the compliment. What better way to open a door to The Door? Paul tells me NOT NOT NOT to cut myself off from the world; only from backslidden Christians. WM is NOT a backslidden Christian. In my book he's first time evangelism material with a pre-existing knowledge of the bible.
The feeling is mutual..and right now he is winning
Then might I suggest that the best thing we can do with him is not have chatty conversation about this and that. The only thing we should do is present a united Christian front with him: "Repent and Believe!"
I know you have discussed with him before; he doesn't need to discuss Arminianism vs Calvinism, he needs Lost vs Saved.