The Form of Government, which you admire, when its Principals are pure is admirable indeed. It is productive of every Thing, which is great and excellent among Men. But its Principles are as easily destroyed, as human Nature is corrupted. Such a Government is only to be supported by pure Religion, or Austere Morals. Public Virtue cannot exist in a Nation without private, and public Virtue is the only Foundation of Republics. There must be a possitive Passion for the public good, the public Interest, Honour, Power, and Glory, established in the Minds of the People, or there can be no Republican Government, nor any real Liberty. [bold face mine]
John Adams to Mercy Warren April 16, 1776.Adam's links Christianity with the fall; as did James Madison, understanding our corrupt nature is imputed to us by Adam's sin. Thus, it isn't a stretch, at this time in his life, to conclude Adams believed in imago dei (unalienable rights imputed by Adam), and pre-destination.
The imputation of sin, unalienable rights, and pre-destination, is accomplished by the same process.