Kathleen Parker is a columnist for the Washington Post Writers Group. Email: kathleenparker@washpost.com. At a time when more than 400,000 children are in foster care nationwide, the city of Philadelphia is threatening to cut ties with Catholic Social Services because of the group’s policy against placing foster children in same-sex households. On the surface, one might say this is a classic case of state vs. church: The city must uphold its policies forbidding discrimination […]