It takes people with strong Christian ethics to honor the ideals of the Nation, and to recognize that an interjection of Faith and Government will corrupt both, and I think that's what the Founders understood then that we do not understand now.
Pray to God to reach the right decision when it comes to secular government and law, and recognize that you may find yourself in a position where you will have to enforce a law that you, as a Christian, do not agree with, but you should not make that decision based on anything other than secular law because you also recognize your sworn duty as a servant of the people of the United States.
By his actions, Roy Moore has shown that this was a deliberate act meant to incite the sort of controversy that we see today, he defies our legal system and recognizes no authority above his. He swore an oath as a State Civil servant that he did not intend to keep, which in and of itself should be a impeachable offense.
Roy Moore accepted this "gift" in the name of the people of Alabama, without consulting anyone, yet he's since refused similar gifts from other Alabama citizens, including a statue of Dr. Marting Luther King, Jr., and a group representing atheists who wanted their point of view receiving the same coverage that Roy's Rock is getting...Moore refused to allow them to place their display in the rotunda.
Moore openly comments that his Constitutional duty (Alabama State Constitution) makes him recognize the God of Judeo-Christian beliefs, and none others.
Here's the pertinent section of the Alabama State Constitution:
SECTION 3Religious freedom.
That no religion shall be established by law; that no preference shall be given by law to any religious sect, society, denomination, or mode of worship; that no one shall be compelled by law to attend any place of worship; nor to pay any tithes, taxes, or other rate for building or repairing any place of worship, or for maintaining any minister or ministry; that no religious test shall be required as a qualification to any office or public trust under this state; and that the civil rights, privileges, and capacities of any citizen shall not be in any manner affected by his religious principles.
Moore is unabashedly promoting Christianity above all others, and he is the law in Alabama.
You can't expect government to stay away from religion, if religion continues to try and conduct government.