American Atheists: Big Ad Fail

Fans attending tomorrow's Super Bowl will get to see a billboard ad from American Atheists mocking the Catholic Hail Mary prayer.  Do the Atheists think that Christians will be offended by the ad? I am sure many Catholics will find the ad offensive, and they should because it is something sacred to them.  However, I am not aware of any Christians outside of Catholicism who even pray the Hail Mary.  If Atheists were trying to offend all Christians with their billboard they should have gone more generic to reach a broader audience.  Wasted advertising dollars, if you ask me.  The silly American Atheists should have hired the same firm used by the Mormons.  After all, the Mormons actually have been able to convince a few people they are actually Christian.