Atheist Billboard: Attack or Innocent?

We all have different beliefs, that's fine. We are all free to believe what we want. However, I draw the line at open attacks. This is an attack. Question:

If Christians are accused of "forcing" their beliefs on you when they say "I don't agree with (insert controversial topic)", what then is this billboard?

20131211-191947.jpg

If the answer given is "free speech" then please accept the title of "Hypocrite".