What might it mean kevin feels caught between different fathers at home with his family and at school with his teacher who is priest

Each of them looks a lot like certain traits of a father and one is his real father while the other is his spiritual father. This double meaning adds a little confusion but also help you to see how the character feels about the two. Kevin's earthly father may not be living the standards that his Heavenly Father has put forth. He should feel protected in the teachings of this bible, and if his priest is following those teachings, and if Kevin is following those teachings, then Kevin is pleasing his Heavenly Father.