Erecting a stone representation of two tablets would be an artistic impression. But, once verbiage is attached, sectarian endorsement is implied because there are (at least) three different schemes for dividing into 10 different "commandments" the original hebrew wording which carried no punctuation.
On the other hand, taking down a long standing (where long is subjective) symbol of God is also an endorsement/promotion/establishment of the religion of "Atheism"; Which would be better named "Adeism".
The phrase "under God" is universal enough that it could be applied to almost any religious sect anywhere. Maybe it never should have been added. But now removing it is a clear endorsement of "Atheism" and a Constitutional problem.