I’m sure you are right. According to this Episcopal bulletin insert, many of the founding fathers were Episcopalians:
http://www.episcopalchurch.org/documents/eLife_insert_063007_8.5x11.pdf
George Washington, Thomas Jefferson, and Patrick Henry attended Bruton Parish, Williamsburg, VA when the legislature was in session.
John Penn, George and Martha Washington, Benjamin Franklin (who is buried in the churchyard), Robert Morris, Francis Hopkinson and Dr. Thomas Bond attended Christ Church, Philadelphia, PA during the Constitutional Convention.
And Alexander Hamilton is buried at Trinity Church, New York City.
Its really sad to think of the current state of the church, given the influence it had two hundred years ago.
I was a sixth-generation Piskie. My gggg grandfather John Bale was baptized in St. Giles Cripplegate (London), the church where Cromwell was married and Milton is buried. Judging from his will (which is still hanging around in a little paper folder in the basement of the Floyd County courthouse), he was a bit of a Freethinker, but he would be absolutely shocked and horrified to see the mess the Episcopal Church has gotten itself into today.
I think a lot of Church of England types in the 18th century had freethinking or Deist leanings, at least from a philosophical point of view (Franklin was definitely one of those). But they never 'left the reservation', in that none of them ever doubted the existence of God (except perhaps Jefferson) or His Providence.