I wasnt neccesaily attacking athiests, to each there own. What I meant was let the kids be kids and they'll figure out the truth about santa and the easter bunny and the rest soon enough. Its not kids putting up the alleged billboard its the grown ups. Get my point now ?
I understand what you're saying and I even agree with it - kids should be allowed to be kids for a few years, be imaginative, and just have fun because life becomes serious far too quickly for most of us.
My issue, as Unrepresented somewhat shows, is the idea that only an atheist would want to put up such a billboard, which is what I got out of your initial post.