Firstly, this is the best part about supporting a strong constitutional candidate. A person like this has no desire for his religion to be forced on anyone, yet he also has no desire to limit freedom of religous expression.
Now, I agree with many and sympathize with all of your arguments. But there is a fine line here that you have to be careful about crossing.
But as a government employee you have no right to use your government job to promote your religious beliefs. You have no right
You have to be careful here, because you're essentially granting that "right" to a private citizen working at a private company, but demanding this right be sacrificed for federal employment.
Here's a completely opposite way to view this. In private business this is easy. The owner sets the rules. If the owner says "absolutely zero religious displays" then fine. You are part of a private agreement negotiated between employee and employer. But once you're a government employee, who should decide where the line is drawn? Now it's a public-private relationship and I think that makes it even harder to place the line appropriately. This is where common decency and mutual respect for others has to come into play.
Unfortunately, we always want things to be black and white but sometimes they aren't. Just about everything will offend somebody. Would the display of a philosophical quote by a religious leader be inherintly offensive because of it's author? Would a quote on faith be inappopriate if it were written by one of the founding fathers? Can a US congressman display an article of faith on the wall in his private office?
How do you figure out where to draw the line? Just because something offends somebody somewhere, doesn't mean it's offensive. What you consider a "promotion" may simply be considered an act of expression from the displayer. Do we really want to always side with the offended?
So while I sympathize with your argument, I woud draw the line somewhere else. For example, I think the 10 commandments are signficant in the historical evolution of modern legal systems. I think a respectful athiest can recognize this without feeling his "rights" (habeus corpus, fair and speedy trial, etc) are being violated simply by their presence. If court employees, the judge, or jury provide ANY evidence through their words or actions that one's religion is effecting their decisions, then we have stepped well over this line.
In my opinion, the 10 commandments are only a "promotion" of judeo-christian religion if you choose to view them as such while ignoring historical consequence. Much the same way as if some chose to demand a Thomas Jefferson portrait be removed from public space because he was a slave owner, therefore his very picture on display on govt property was a "promotion" of something which violates the constitution.