And I suppose Tom too.
We can all debate what GW meant by "liberal" and "pure spirit of Christianity."
As to the former, the notion that mankind should progressively become more "liberal" -- something in which George Washington and the other Founders believed -- is an enlightenment idea and ideal that captured the age.
Whatever GW meant by "pure spirit of Christianity," I doubt he meant Nicene orthodoxy, but something else.
Check it out.