As I've noted before, if one casts a wide enough net, just about all of America's Founders were "Christians," as is Barack Obama, Bishop Spong and all of the Mormons. But according to evangelical minimums, a great deal of them were not.
Fischer conveniently defines those minimums in his article:
... Of the 55 framers of the Constitution, we know as a matter of historical record that 51 or 52 of them swore on oath to evangelical statements of faith,...
According to Dr. M.E. Bradford of the University of Dallas, of the 55 framers, 28 were Episcopalians, 8 were Presbyterians, 7 were Congregationalists, and there were two each of Lutherans, Dutch Reformed, Methodists and Roman Catholics. That left, by Bradford's counting, three deists and one founder whose religious views cannot be determined definitively.
Don't forget that at this time, most churches required sworn adherence to strict doctrinal statements, meaning all 51 of these men swore an oath before Almighty God that they believed the Bible to be God's revelation to mankind and that they themselves believed Jesus Christ to be the Son of God and that they trusted in him for their eternal salvation.
The problem with this is that it isn't true. ME Bradford did not "find" 51 of the 55 framers of the Constitution were "members" of churches in the "I took an oath" sense. All he found was some kind of nominal connection to an orthodox Church. I have one of those too; I was baptized in the Roman Catholic church but never went beyond that step. So did Jefferson -- he was nominally Anglican -- who denied every single tenet of orthodox Christianity. And Jefferson actually did take orthodox oaths when he became an Anglican Vestryman (which was more of a social function). Indeed of the 28 Episcopalians, however many of them did take oaths (understanding there is no proof all 28 of them did), actually took loyalty oaths to the crown that they violated when they rebelled.
There is reason why appeal to authority is logical fallacy and that's because sometimes expert authorities get it wrong. If I am wrong -- if ME Bradford did find that 51 out of the 55 Framers were "members" in the "I took an oath" to an orthodox Church sense -- then prove it by citing the primary sources. I've already looked into this and know "there is no there there" and I'm willing to wager $$ to get Fischer to put up or shut up.
Based on what he wrote in the article Fischer should understand Dr. Bradford's figure is worthless: Even the 3 Deists had those nominal connections to orthodox churches. Yes, BF understands Bradford's 3 Deists weren't really "Deists" but doesn't seem to understand that casts doubt on the credibility of the argument for the other 51-52.
Finally, let us appreciate irony of Christian Nationalists like Fischer using the "oaths" argument as a shortcut to prove the Founders' orthodox Christianity. While they were all God believers and attached to their various sects for social and hereditary reasons, many of them disbelieved and questioned the "official" doctrinal stories that their orthodox clergy sold them. For that reason, many Founders hated sectarian oaths, especially sectarian oaths required for public office. See James H. Hutson's The Founders on Religion, pp. 154-56 to match Fischer's appeal to authority.*
* More on the Founders' explicit anti-oath arguments that reference the primary sources in subsequent posts and perhaps in the comment thread to this post. As I challenged BF, I will put up or shut up.