I've noted Founding Father William Livingston as a less than well known figure who fit this description. And indeed, he was so accused. As Livingston himself wrote:
It is well known that some have represented me as an Atheist, others as a Deist, and a third sort as a Presbyterian. My creed will show that none have exactly hit it. For all which reasons, I shall cheerfully lay before you the articles of my faith. * * *
Livingston then humorously details his "creed" which is really an anti-creed, rejecting, among other things, the concept of creedalism itself, orthodoxy, ecclesiastical authority, and (of course) sectarianism. All in the name of the Bible and "Christianity," of course.