You're working hard to ignore their intent here.
I don't think so... I think it's quite obvious their intent is to counter the 10 Commandments monument. Their methodology may be up for debate but I still fail to see how quoting the bible is akin to bashing it.
If that was their point then why not include a few good quotes from the Quran?
Because there isn't (is there?) currently a monument to Sharia Law there.
Farewell to this land's cheerless marches
Hemmed in like a boar between arches
Her very Lowness with her head in a sling
I'm truly sorry but it sounds like a wonderful thing