James and John may have left their father in the boat when they responded to Jesus' invitation to become fishers of men but they still carried his "spirit". We applaud their courage to leave their "world" and what they thought they knew to be a part of an inner circle with a man and a message that attracted them. But some things aren't exposed immediately and time and experience are required for some things to come to light.
I'm guessing that these boys were steeped in the tradition and writings of their religious community. They may have even thought that they were like their father Abraham when they left their father to follow Jesus into unchartered territory. They new of Elijah and the God he represented when hearing the story of fire being called down on those who reject Yahweh. They learned the spirit of their father that embedded its perspective so deeply that it took a particular incident for it to be exposed. And this spirit was not accurate, in spite of the prophet that demonstrated it and the Scripture that documented it.
We know this because of what we have recorded in Luke 9: 51-56. James and John probably thought they would be commended for not only paying attention in Sunday School, but also for finding a relevant and timely application for what they had learned. They were confident in their theology. Their eagerness to judge people and wipe them out was confronted and condemned by God in Jesus Christ. The spirit of Zebedee was trumped by the Spirit of God.
They were ready and willing to use the Scripture but they lacked the right spirit. This is like the Pharisees who brought the adulterous woman to Jesus quoting Scripture but failing to know the Spirit. Jesus redirected them too.
I come from the same background in which I learned the Bible and embraced judgementalism as part of the spirit of God. Yes, I had left "my father" in "the boat with the hired servants" feeling sure of my personal conversion. I even went into professional ministry for 25 years. But I see myself in James and John, quick to judge in self-perceived righteousness but slow to understand how that spirit is not the right Spirit.
By Gods grace and the Spirit and words of Jesus, I, like James and John, am being confronted at deeper levels of theological error. The Spirit of God filters our interpretations of Scripture to more accurately reflect the God of the universe.