It is an attack on all religions,"

Well how about a new campaign using varied slogans and then publisizing the reactions?

I was thinking of mix of slogans like:

"There's probably no Zeus so it's safe to go out in a storm"
"There are probably no fairies so enjoy the forest"
"There's probably no Apollo so just enjoy the sun"
There's probably no Eros, so love must be natural"
"There are probably no Unicorns, but Barbie still sells them"
"There's probably no Delling, but dawn happens all day everyday somewhere in the world"
"There's probably no Ehecatl, so just get out there and enjoy sailing"
"There's probably no Cizen, but you're going to die anyway"
"There's probably no Vulcan, but Pompei is still worth a visit"

etc ....

It might demonstrate the extent to which we are all athiestic about somethings and highlight the similarities between past and present mythical powers.