During a recent vacation, my wife and I visited a famous athletic complex. The gates were wide open, and it appeared that we were welcome to visit. We enjoyed touring the grounds and admiring the well-manicured sports fields. As we were about to leave, someone stopped us and coldly told us we were not supposed to be there. Suddenly, we were reminded that we were outsiders—and it felt uncomfortable.

On that vacation we also visited a church. Again, the doors were open, so we walked in. What a difference! Many people greeted us warmly and made us feel right at home.…