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There are always the initials "JC" but beyond that Casey is a visionary and a rebel. Originally a preacher Casey is not happy with mainstream religion, he no longer feels "the calling". Instead Casey opposes the corrupt authorities in charge, just as Christ opposed the PHARISEES. Casey joins a union and becomes something of a sage with followers that seem more like apostles. Even Tom is convinced that Casey is "on to something" and looks for his meaning.
Oh I forgot the whole innocent suffering martyr thing. Casey basically gives his life for the betterment of others in the book. He inspires a new way of thinking, a sense of fairness and brotherhood rather than greed and division. That's pretty Christ-figure-like!
The 12 original family members that Casy went along with represents the 12 disciples.