(Warning: If you possess religious sensibilities and they are easily offended, I advise you to refrain from reading further. And especially if you think the following quote from Voltaire is a bunch of bullshit: “I disapprove of what you say, but I will defend to death your right to say it.”)
In response to the atheist ads, there is this.
And for sarcasm, there is this:
This strip is from a hilarious web comic Jesus and Mo, poking fun at two of the world’s biggest organized religions. It features Jesus and Mohammed who are room-mates, and an atheist barmaid at the local pub where they go drinking.
“The simply drawn comic features two present day religious prophets, Jesus and Mo. While Jesus is portrayed as the actual Christian prophet, Mo claims to be a body double, apparently using casuistry to get around the restriction in Islam of representing the Islamic prophet Muhammad pictorially.”
Wikipedia
The inaugural strip clarifies the above comment:

loved jesusandmo…thanks for making my day again