The law already does allow all those other texts, and despite your ill-based assumption, I truly have no problem with that. Please don't blame me for the fact that a predominantly Christian society expresses no urge to place statues of Buddha in front of their courthouses.
What I do object to is "the Law" (aka 'Rogue Courts') discriminating only against Christianity, in all its forms and at every turn.
Then again, Jesus did predict that this would happen over 2,000 years ago, so while I object to it, it doesn't surprise me... any more than does your judgemental venom for my fair and honest observation.
So the majority gets to tell everyone else that they are living in a state that officially recognizes one belief above theirs. I thought that wasn't supposed to happen here. It's a very slippery slope.
I have a feeling those other religions don't try to put up those things because they have more respect for the beliefs of others, or they feel marginalized by the Christian majority and therefore powerless to try to get their beliefs expressed in that manner.