I don’t know, let the atheists waste their money. It may unwittingly drive more people to think about Jesus, and whether they celebrate the holiday for secular or religious reasons.
It is a sinful billboard, to be sure, but I don’t know if I’d blame Lamar advertising. I think I might try to put up something like:
Have EID without Mohammed! It’s ok to have a holiday without a false prophet!
And see if Lamar would accept it. If not, the other one should be taken down.
The billboard cost $25,000 and was paid for by an (I’m guessing) anonymous member of American Atheists who resides in New Jersey.