Um, sorry, but what were you looking for? A magic pill or book that suddenly makes him 'okay' with everything? Read around, there's not such thing and this question has been asked over and over by many many people. People in long term mono relationships, people starting out. Here's the two main points you've been given so far.
1) If you just gave a talk about poly to a church, you should have the answers you need. Now you just need the questions. Ask him what questions he has so you can answer them!
2) Communication. All you can do is be open honest and talk to him.
Let him do the internal work he needs to. But if you came here wanting all these answers on how to MAKE someone suddenly accept and/or love poly, you so shouldn't have given ANYONE information on poly. Or mono. Or dating. At all.