Not really. I see no problem with a historically based monument in the courthouse. It's an honor to memoralize those who came before us.
Actually, Moore has publicly stated repeatedly that "This is not a nation established on the principles of Buddha or Hinduism. Our faith is not Islam. What we follow is not the Koran but the Bible. This is a Christian nation." To say that the monument is only an honor for our forefathers and nothing else ignores Moore's frequent and strident statements about his personal beliefs.
You gotta wonder what happens to a Buddhist, Hindu, or Muslim unfortunate enough to be brought before Judge Moore's court.