Well, that's unfortunate.
This real church billboard was placed in Mansfield, Ohio, as a response to the Freedom From Religion Foundation's "Good without God" campaign.
It caused Hemant Mehta of The Friendly Atheist to comment:
"Not only are they telling us that god doesn’t exist (in a large font, no less), they’re also telling us to be skeptical of what we hear! I couldn’t have said it better myself :)"