Given that Quakers didn't believe in taking up arms it was difficult to be both a "Quaker" and a "Founder" (at least one who supported the American Revolution) at the same time.
So the two most
notable of America's Founders who happened to be both, technically,
weren't actual members of the Quaker club but considered themselves
something different. (On a personal note, I use the word "Quakerish" to
describe my religious sentiments.)
Those two men were John Dickinson and William Livingston. This links to a letter by Livingston to an actual Quaker whilst Livingston was serving as Governor of NJ in 1778.
while trying to balance the Quakers' privilege to absolutely refuse to
take up arms against the British, with the right of the State to demand
citizens do such, gives us a hint as to his personal faith when he
says, "I am more than half a Quaker myself."