We’re making some progress on finding bus ads that were a bit more compelling than those devised by the clerical authorities in England.
Thanks especially to the posters at Crunchy Con and Jesus Creed. A few possibilities from the early offerngs:

bob d
OMG!
Fodder John
“My last name isn’t “dammit” – God”
Fred of Paris
Visual: a coffin
Text: “do you really want this to be your last stop?”
kissiray
I believe there is air and sound waves. I believe in the speed of light. Why are you so worried if I believe in a God that you can’t see or hear or touch.
Gerard Nadal
What if I decide YOU don’t exist? -God
Curmudgeon
There are 60,000 religions. They can’t all be wrong.
lea
when I said “I AM” I meant it …
Erin Manning
“There’s probably no bus. You’re just a lump of animated carbon with a *really* good imagination.”–God
Scott Lahti
From a brick-wall graffito in an old Benny Hill sketch:
God is dead. – Fred.
Fred is dead. – God.
elmo
“I believe in you.”–God
Alicia
I’m thinking, a deep focus picture of the Universe taken by the Hubble space telescope with a one word slogan, either “Why?” or “Wow!”
jestrfyl
“I believe in you, and that’s enough for now” God