I got to tell you that if ANY billboard put up by ANY human being of ANY religious or non-religious persuasion causes anyone to question their OWN faith, then THAT person aint got no faith at all. And I'll say that if any FBI sting can drive a peaceful "moderate" muslim to boast of wanting to commit a terrorist act against hundreds of women and children in the name of Jihad on another religion's celebration, then that muslim ain't moderate at all.
The billboard is not offensive in the least. What is offensive is the notion Islam is loved by Liberals or Atheists. We think they are even worse than most American Christians. Unfortunately for all involved, its the American Christians who impact us on a day-to-day basis.
I mean, just because we think you're irrational, it does not mean we think your opposition is sane.