Other religions in Romania include Roman Catholicism ( 4.7 % ) , Protestantism ( 3.7 % ) , Pentecostalism ( 1.5 % ) and the Romanian Greek-Catholicism ( 0.9 % ) . Other important Christian denominations include Roman Catholicism ( 4.7 % ) , Protestantism ( 3.7 % ) , Pentecostalism ( 1.5 % ) and the Romanian Greek-Catholic Church ( 0.9 % ) .