George Ross was an Anglican.
From: B. J. Lossing, Signers of the Declaration of Independence, George F. Cooledge & Brother: New York (1848) [reprinted in Lives of the Signers of the Declaration of Independence, WallBuilder Press: Aledo, Texas (1995)], page 130:
George Ross was born in New Castle, Delaware, in the year 1730. His father was a highly esteemed minister of the Episcopal Church in that town, and he educated his son with much care, having experienced the great advantage of a liberal education.
From: Robert G. Ferris (editor), Signers of the Declaration: Historic Places Commemorating the Signing of the Declaration of Independence, published by the United States Department of the Interior, National Park Service: Washington, D.C. (revised edition 1975), pages 122-123:
The oldest son of an Anglican clergyman who had immigrated from Scotland, Ross was born in 1730 at New Castle, Del. After a preliminary classical education, he read law with his stepbrother John at Philadelphia and in 1750 entered the bar.
...Ross... died in Philadelphia in 1779. he was buried in Christ Church Burial Ground.