Are Atheist really mad that our founding fathers built this country to be a God fearing nation?
No, atheists are unhappy that Christians are trying to rewrite history and turn this secular nation into a Christian one. There's no doubt the majority of Americans are and have always been Christians. There's also no doubt that this nation was radically secular when it was crated. The two things can live together in perfect harmony if you'd just let it.
Tell me, what changes about our nation if it is in fact Christian? Does that mean persecuting non-Christians is okay? What exactly is it that Christians think they get by calling this a Christian nation?