Government Oaths. Government has no place declaring in whose name government oaths should be sworn. Whether oaths of office or in court, those swearing people in should not include "so help you/me God" in the recitation. Individuals swearing those oaths are certainly well within their rights of expression to add personal invocations to the higher power of their choice, should they so chose. But making that invocation part of the administration of the oath is inappropriate institutionalization of religious belief on the part of the state.
The two preceding blogs are Separation of Church and State: A Founding Principle, and Separation of Church and State II: Necessary for the Protection of Both. Here's a snippet from Part II that cites Joseph Smith, which is accepted as Mormon scripture (Kirtland, Ohio, 17 August 1835, Doctrine & Covenants 134:4-5, 9):
We believe that religion is instituted of God; and that men are amenable to him, and to him only, for the exercise of it, unless their religious opinions prompt them to infringe upon the rights and liberties of others; but we do not believe that human law has a right to interfere in prescribing rules of worship to bind the consciences of men, nor dictate forms for public or private devotion; that the civil magistrate should restrain crime, but never control conscience; should punish guilt, but never suppress the freedom of the soul.
We believe that all men are bound to sustain and uphold the respective governments in which they reside, while protected in their inherent and inalienable rights by the laws of such governments; and that sedition and rebellion are unbecoming every citizen thus protected, and should be punished accordingly; and that all governments have a right to enact such laws as in their own judgments are best calculated to secure the public interest; at the same time, however, holding sacred the freedom of conscience. (emphasis added)
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We do not believe it just to mingle religious influence with civil government, whereby one religious society is fostered and another proscribed in its spiritual privileges, and the individual rights of its members, as citizens, denied.
Note: Joseeph Smith (age 29) wrote this before the oppression imposed by the state of Missourri and in Illinois with the assasination of Joseph Smith, and later, imposed by the federal government during the Mormon resettlement in the Great Salt Lake Rocky Mountain Basin.