"If either pure five-point Calvinism or its consistent repudiation in pure Arminianism were completely faithful to Scripture, it is doubtful that so many Bible-believing, godly evangelical Christians would have wound up on each side. The former wants to preserve the Scriptural emphasis on divine sovereignty; the latter, on human freedom and responsibility. Both are right in what they want and correct to observe in Scripture the theme that they stress."
The problem with this line of reasoning is that it fails to take into account that Christians can be and often are wrong about their theology. A notable example of this is the controversy over the deity of Christ in the early part of the Church. Athanasius stood for the biblical teaching of the deity of Christ, even in the face of great resistance. Athanasius Contra Mundum, Athanasius against the world was his take on his situation. If Athanasius used the above line of reasoning he would have said, "Well, so many godly men believe that Christ is not divine, so I must be wrong." But he did not use this reasoning and neither do we on the issue of the deity of Christ.
Even in our own day there are many who are far more pious than I who believe that Jesus is a created being or who hold that Jesus was adopted as the son of God. But we do not do theology by counting heads. Rather, we do theology by rigorous and thorough exegesis. I am sure that Dr. Blomberg would agree with this point even though he begins his article with this less than persuasive line of reasoning. The issue over Calvinism and Arminianism is fought on the pages of the sacred Bible and not in the halls of higher thinking.