Take one look at this solid-looking church and that old hymn may come to mind: "A Mighty Fortress is Our God."  The church, across the street from the Emmaus Post Office, was the site of a miracle.  In 2000, the building blew up when a pressure relief valve failed to open in its heating system. The miracle is that no one was killed by the explosion, which literally lifted the building into the air. It happened early on a Sunday morning, hours before worship services. Nearby St. John's Lutheran Church graciously hosted St. Matthew's congregation for the two years it took to rebuild the church.