Characters
I can't believe that any of you can walk into a church without bursting into flames.
— Kitty Forman ‧ That '70s Show

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
An exasperated speaker voices amazement that people can enter a church unscathed, implying they are so sinful that flames should engulf them. The exaggeration is comic and disapproving, mixing moral outrage with hyperbole. Its humour lies in treating wrongdoing as though it deserved spontaneous combustion.
Context reviewed