A conversation with elders or cong members never has to advance beyond initial greetings. If they try to get into something I just jump in and say, " Sorry but any conversation revolving around god or religion just sets me off into a deep depression that threatens my mental and physical health. If I want to talk about some thing I'll call you. Have a nice day and goodbye."
If they come around asking to sign a new copy of the blood card, I will tell them the old one( which actually is in a garbage dump somewhere) works just fine. Bye.