@bob
I see your reasoning, but I interpret Adams differently. I believe that he indeed was against religion, but merely acknowledged that in fact it was the root of all order in the world at that point in time. To elaborate:
The question before the human race is, whether the God of nature shall govern the world by his own laws, or whether priests and kings shall rule it by fictitious miracles?
—John Adams, letter to Thomas Jefferson, June 20, 1815
As I understand the Christian religion, it was, and is, a revelation. But how has it happened that millions of fables, tales, legends, have been blended with both Jewish and Christian revelation that have made them the most bloody religion that ever existed?
—John Adams, letter to FA Van der Kamp, December 27, 1816
When philosophic reason is clear and certain by intuition or necessary induction, no subsequent revelation supported by prophecies or miracles can supersede it.
—John Adams, from Rufus K Noyes, Views of Religion, quoted from from James A Haught, ed, 2000 Years of Disbelief
Cabalistic Christianity, which is Catholic Christianity, and which has prevailed for 1,500 years, has received a mortal wound, of which the monster must finally die. Yet so strong is his constitution, that he may endure for centuries before he expires.
—John Adams, letter to Thomas Jefferson, July 16, 1814, from James A Haught, ed, 2000 Years of Disbelief
I almost shudder at the thought of alluding to the most fatal example of the abuses of grief which the history of mankind has preserved—the Cross. Consider what calamities that engine of grief has produced!
—John Adams, letter to Thomas Jefferson, from George Seldes, The Great Quotations, also from James A Haught, ed, 2000 Years of Disbelief
What havoc has been made of books through every century of the Christian era? Where are fifty gospels condemned as spurious by the bull of Pope Gelasius? Where are forty wagon-loads of Hebrew manuscripts burned in France, by order of another pope, because of suspected heresy? Remember the Index Expurgato-rius, the Inquisition, the stake, the axe, the halter, and the guillotine; and, oh! horrible, the rack! This is as bad, if not worse, than a slow fire. Nor should the Lion’s Mouth be forgotten. Have you considered that system of holy lies and pious frauds that has raged and triumphed for 1,500 years.
—John Adams, letter to John Taylor, 1814, quoted by Norman Cousins in In God We Trust: The Religious Beliefs and Ideas of the American Founding Fathers (New York: Harper & Brothers, 1958), p. 106–7, from James A Haught, ed, 2000 Years of Disbelief
God is an essence that we know nothing of. Until this awful blasphemy is got rid of, there never will be any liberal science in the world.
—John Adams, “this awful blashpemy” that he refers to is the myth of the Incarnation of Christ, from Ira D Cardiff, What Great Men Think of Religion, quoted from James A Haught, ed, 2000 Years of Disbelief
Now, considering these less ambiguous, and un-truncated quotes, do you still think he believed “the world was hell without religion”, ‘cause I can do this all day :)