As said earlier, most of the Lombards converted to Christianity when their King, Adaloald, was baptized in 603.
(http://www.cardinalseansblog.org/wp-content/uploads/2006/10/cross-in-the-chapel-at-cathedral.jpg) This is a mini replica of the scene in the bible Jesus' crusafiction.
Before 603 though, the Lomabrds were almost all pagan.
Most could even say that the Lombards before 603 A.D. were Christian haters, and many times set forth and attacked the Pope and his Holy Roman Empire.
