A Parking Problem

A few years ago, there was a news story on the radio about a synagogue that had a problem with the Baptists down the street. Some Jews were unable to find a space in their own parking lot because members of the nearby Baptist church, which met earlier in the morning for revival meetings, got there first.
So the synagogue had a problem.
Now they could have towed the Baptist's cars away. Or they could have patrolled their lot Saturday mornings. Or they could have written a letter to the offending church members, imploring them to park elsewhere, but they didn't.
Instead, they used bumper stickers.
One Saturday morning they stuck a bumper sticker to every car in the lot, Baptist and Jewish alike. The sticker read:
"I'M PROUD TO BE JEWISH!"
No more parking lot problems.