I'm afraid vandals provided the only humour I've heard of on church signs, with two separate amendments to the classic "Jesus saves!" sign.

The first is exceptionally old and cheesy and is included purely for completeness (that, and it makes the second one seem so much better by comparison)

"Jesus saves - he couldn't on my salary."

The second was allegedly spotted on a church near a football stadium...

"Jesus saves, but Maradona knocks it in from the rebound"