When the war had finished and Sumich returned to Croatia he found a "flourishing faith". "They had broken free from communism and the church was free". "Everyone had rosaries in their pockets." Sumich found himself "practising as a Catholic for the first time in my life, as distinct from just going to Sunday Mass. He wanted to know more about the Faith, because I'd just forgotten everything". His mother sent him a Catechism of the Catholic Church, which he "sat down on a beach and read" over one summer. "It all made sense". He started going to frequent Confession and "finding a sense of shame which probably hadn't existed before". At age 34, Sumich set aside a year, praying intensely, including the 15 prayers of St Bridget of Sweden and the Rosary. At this time, he was the coach of the Croatian rugby team. "We would be playing at the Hong Kong Sevens and my rosary would be in my pocket and I would finger it". Sumich liked to challenge his players. "I would say to them, 'strong moral life, strong character on the rugby field; weak moral life, and you are the first one to chuck the towel in when the going gets tough' ". Returning to New Zealand, Sumich found local liturgies very different from what he had become used to in Croatia. But, in Auckland, he was introduced to the "awe-inspiring" Tridentine Mass celebrated by Denzil Meuli at Titirangi. Sumich "felt God's call and sought an order using this rite". He was accepted by the Priestly Fraternity of Saint Peter and went to their formation house, the International Seminary of St. Peter in Wigratzbad-Opfenbach, Bavaria, but he did most of his studies in Denton, Nebraska at Our Lady of Guadalupe Seminary where he was ordained deacon in March 2008.
Priesthood
Sumich was ordained a priest on 29 November 2008, at St Michael's Church, Remuera, Auckland, by Basil Meeking, Bishop Emeritus of Christchurch, using the 1962 Roman Missal and Rite of Ordination. He offered his first Mass on the First Sunday of Advent ; he was the first New Zealander to be ordained for the Priestly Fraternity of St Peter. After his priestly ordination he was stationed in Orlu, Nigeria where he had also served following his ordination as a deacon. In 2011, Sumich was the Rector of St. Gregory's Academy, an American Catholic boarding school located in Elmhurst, Pennsylvania. Sumich served as associate pastor for the Latin Mass community at St. Anthony's Parish in Calgary Alberta, Canada. in 2016, he returned to New Zealand to serve the Latin Mass community in West Auckland.
