Wrong again.
Indeed, it was a joint effort of Preston and Jackson that got a famous black Sunday school class underway. Whites had taught the tenets of Christianity to slaves and freedmen as early as 1843, when Colonel Smith organized a Sunday school for slaves in Lexington. Two years later, St. John's Episcopal Church in Redmond began such a Sunday school. Lexington Presbyterians undertook a similar project at the same time. Local opposition and lack of participation doomed all three of these initial experiments.The Lexington school was started in 1845 by Dr. Ruffner and Rev. Lacy, which quickly failed along with the other two.
James I. Robertson, Jr., Stonewall Jackson: The Man, The Soldier, The Legend, New York: Simon & Schuster Macmillan, 1997, p. 167
A decade later Jackson and Preston started their own school.
'He [Jackson] next proposed to gather the African slaves of the village in the afternoon of the Sabbath, and speedily he had a flourishing school of eighty or a hundred pupils, with twelve teachers; the latter of whom were recruited from among the educated ladies and gentlemen of the place. This he continued to teach successfully from 1855 until the spring of 1861; when he reluctantly left it to enter the army. And to the end of his life, he inquired of every visitor at the camp from his church at home. How his black Sabbath-school was progressing.'This time, under Jackson, blacks were begging to be admitted:
Robert L. Dabney, Life and Campaigns of Lieut. Gen. Thomas J. Jackson, (Stonewall Jackson), New York: Blelock & Co., 1866, p. 92
While thus exacting in his discipline of the school, he was rendered extremely popular among all the more serious servants by these labors for their good. He was indeed the black man's friend. His prayers were so attractive to them, that a number of them living in his quarter of the town, petitioned to be admitted on Sabbath nights.VMI Cadet Samuel B. Hannah wrote of Jackson, 'the Gen. took quite an active part in the church and was the founder of the Colored Sunday School and the main stay of it as long as he was in Lexington.'
Ibid, p. 94
Jackson did not contunue an existing school, he started one, and kept it flourishing.
Complete nonsense. You admit that the school had been started in 1845 by Dr. Ruffner and Rev. Lacey and then insist that Jackson founded it? You claim it quickly failed but as Byron Farwell documents in "Stonewall: A Biography of General Thomas J. Jackson" the school was a success with as many as 100 students at a time participating, and the success continued until Dr. Ruffner and Rev. Lacey left Lexington. The school did go into hiatus until restarted with Jackson as the teacher The only difference between the schools seems to be that Dr. Ruffner was anti-slavery and Thomas Jackson was not.