“What students would learn in American schools above all is the religion of Jesus Christ.”

A modern fabrication, possibly derived from David Barton's claim (Original Intent, p. 85) that "By George Washington’s own words, what youths learned in America’s schools 'above all' was 'the religion of Jesus Christ.'”. Washington did use the phrase "above all the religion of Jesus Christ" on 12 May 1779 in a reply to a petition from a Lenape delegation asking for assistance in promoting the missionary activities of David Zeisberger among their people: "You do well to wish to learn our arts and ways of life, and above all, the religion of Jesus Christ. These will make you a greater and happier people than you are. Congress will do every thing they can to assist you in this wise intention..." He did not say anything about "What students would learn in American schools," though earlier in the same reply he did say "I am glad you have brought three of the Children of your principal Chiefs to be educated with us." While there's nothing in the reply about how those "Children" might be educated (in fact Congress put two of them through Princeton) it's possible that suggested the fabricated portion. See Louise Phelps Kellogg, Frontier Advance on the Upper Ohio 1778-1779 (Madison WI, 1916), pp. 317-324, for the episode. Washington's reply is also found in John C. Fitzpatrick, The Writings of George Washington from the Original Manuscript Sources, 1745-1799, vol. 15 (Washington D.C., 1936), p. 55
Misattributed, Spurious attributions