The question that Eric raises is this: “In what way should the Old Testament inform our understanding of the church and how we should interact with one another?”
As he points out, some modern organizational structures among the church are often justified and explained by referring to similar structures found in the Old Testament. Eric suggests that this is a misuse of the Old Testament.
He especially points to the book of Hebrews in which the author identifies many of those structures as “shadows” that were meant to point to Jesus Christ.
The interesting thing, as one person mentions in the comments, is that the earliest followers of Jesus did not have the New Testament. And, they were exhorted to consider the Old Testament Scriptures as important for their lives (even for their learning, according to Paul).
So, I’ll ask you, how do we use the Old Testament to help us understand how to live with and interact with one another as God’s children?