Certainly within the law, such an action will spark intense discussion, I think. Whether I agree or not, my left and right sides of the brain are in disagreement at the moment.
Republicans propose declaring Idaho a Christian state - Yahoo News
"When fascism comes to America, it will be wrapped in the flag and carrying the cross." Sinclair Lewis
"The state action requirement stems from the fact that the constitutional amendments which protect individual rights (especially the Bill of Rights and the 14th Amendment) are mostly phrased as prohibitions against government action. For example, the First Amendment states that “[c]ongress shall make no law” infringing upon the freedoms of speech and religion. Because of this requirement, it is impossible for private parties (citizens or corporations) to violate these amendments, and all lawsuits alleging constitutional violations of this type must show how the government (state or federal) was responsible for the violation of their rights. This is referred to as the state action requirement. "
State Action Requirement Wex Legal Dictionary Encyclopedia LII Legal Information Institute
Amendment I
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
In other words, not Congress nor sub-Congressional level entities or individuals can make a law respecting any particular religion.