New statistics just released show that the Catholic Church has made substantial gains (up 1.49%) since the last census. The Mormons are also up by 1.71%, as are the Assemblies of God (up 1.27%). Others in the top ten church bodies in America have no change (Church of God in Christ, both bodies of National Baptists), or are down (Southern Baptists -0.24%, United Methodists -0.98%, Evangelical Lutherans -1.62%, Presbyterian Church USA -3.3%.
Source: 2010 Yearbook of American and Canadian Churches