He was probably a Unitarian so I don't know if you could consider hin a Christian. He is buried in the United First Parish Church (Unitarian) in Quincy, Massachusetts. It is possible that this church was still formally Congregational at the time of Adams. The final split between Unitarianism and Congregationalism took place about 1834. Fourteen of the Sixteen Congregational Churches in Boston, for instance, declared for Unitarianism at that time. What is interesting is that was almost the precise time when the Congregational Church was dis-established in Massachusetts.

His biography, by David McCullough, should be required reading for every high school student in America, and for every immigrant wishing to be naturalized. Americans should know the attributes, both positive and negative, of what we call today, the Founding Fathers. Very complex man, blessed with good fortune and cursed by betrayal, his own mis-judgments and odd happenstance. Far from perfect, as all men should be portrayed by history, but brilliantly brave, stubborn and idealistic.