Though few know about it, the Twin Cities' Coptic Orthodox community is quietly growing by about 15 families a year, with plans to expand its home base at St. Mary's in South St. Paul. The archdiocese also built a second metro-area church in Plymouth eight months ago and is adding masses there. Families are coming to Minnesota from other parts of the U.S. and immigrating from Egypt, too, to avoid persecution and pursue higher education.