“That there is no God, no devils, no angels or heaven” and that, “Religion hardens the heart and enslaves minds.”
Yeah, that will win over hearts and minds...
I appreciate the fact that you have no objection to the placement of the nativity scene. I'm a Christian who has no objection to atheists who want to post their own plaques. However, our personal opinions shouldn't matter. That's really the issue here. Are minority rights harmed when the majority, to include government employees, make religious (or nonreligious) expressions? In other words, is this constitutionally prohibited?
We have this mess of litigation thanks to a feckless Supreme Court that has made a complete muddle over one of the clearest parts of the US Constitution. I don't think anyone knows what is and isn't permissible religious expression any more thanks to the court's horribly inconsistent rulings.
That is the key.
I think that minority rights are harmed when explicitly religious issues are written into the law. For example, the courts were quite right in throwing out laws which prohibited business openings (or any other otherwise legal activity) on Sundays. Example #2, sexual activity (of any sort) between consenting adults in private is none of the law's business.
However, things such as display of a creche on the courthouse lawn or a cross in the city seal should be addressed through the political process. If enough people don't like them, elect a mayor or a governor who will get rid of them. If not, then they stay.