If I'm in a part of the country where "God bless" is a common reply I take it for what it is. If some stranger comes up to me and then starts to talk about "God loves you" I won't take it as heartfelt. I'll take it as proselytizing. I gave a ride to the store to some guy that lived in the same apartment complex that I lived in, years ago. When we got back, before I could get him out of my car, he started talking about "repaying" me with a prayer and then I had to sit there until he had finished the prayer before I could get him out of my car. I wasn't pleased.