Yes they did...Go back and look.
Putting up a billboard during the holiday season that calls Christmas a "myth" isnt "attacking religion."
ORLY???????!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?????????????
“Every year, atheists get blamed for having a war on Christmas, even if we don’t do anything,” he said. “This year, we decided to give the religious right a taste of what war on Christmas looks like.”, - David Silverman, the president of American Atheists and the man behind the billboard,
http://cityroom.blogs.nytimes.com/2010/11/29/for-the-holidays-an-atheism-billboard/
Sounds like an "attack" to ME.
Bingo.