It happens two ways.
First, the family is on their way to Church, and they begin to fight. Dad is yelling. Mom is frustrated, and everyone’s temper has reached its limits. Then they step out of the car, and everyone is suddenly happy. They paint on their smiles and tell everyone that everything is fine.
Second, I went to a Christian musical. On the way into the show, everyone in the parking lot was happy and letting others move through traffic without a care. Then the show was over, and those same people returned to their cars with a vengeance. People were cutting each other off, honking, and, I think, yelling a few obscenities.
One of the challenges of being a Christian is to always live like Jesus.
We are not to behave one way at religious gatherings and the opposite way the rest of the time. Jesus is meant to impact my actions both before and after we come together to worship him.
You are either a full-time Christian or not one at all.