GREENVILLE, S.C. — Two universities with Baptist roots, Furman and Mercer, have received multimillion-dollar gifts. Furman, in Greenville, S.C., will receive 45 percent of the estimated $400 million holdings of John D. Hollingsworth, 83, who attended the university for just one year. The gesture by Hollingsworth, who died Dec. 30, made the pages of The New York Times, which described…