A turning point in the Jesus movement, Peter baptizes the Roman centurion Cornelius, the first non-Jewish Christian, in Jerusalem (Acts 10), as shown in one of five baptism scenes on a 12th-century baptismal font in St. Bartholomew’s Church in Liège, Belgium. Image: Jean-Pol Grandmont.

http://www.biblicalarchaeology.org/daily/biblical-topics/new-testament/the-origin-of-christianity/