mamahicks on Family Tree Circles

The Martins came over from England w/ the Quaker group who immigrated to Pennsylvania. They then migrated to NC, VA, KY, and then throughout the U.S. in the 20th century. At some point in the 1800s, they blended in w/ the religion of the local region where they were living. How do you go about accessing that information? The Canadian census listed "religion" but ours does not.