In Carl Trueman's article, "Protestants Need to Go Back to Basics", he states:
Are disagreements on theology proper -- like the ones mentioned on simplicity, impassability, eternal generation and God's foreknowledge -- more serious than disagreements on soteriology, such as justification?
A recovery of classical theology also raises an interesting ecumenical question. Why do Protestants, especially those of an evangelical stripe, typically prioritize the doctrine of salvation over the doctrine of God? If an evangelical rejects simplicity or impassibility or eternal generation, he is typically free to do so. But why should those properly committed to the creeds and confessions consider that person closer spiritually to them than those who affirm classical theism but share a different understanding of justification?
This is a real issue. At an Association of Theological Schools accreditation meeting I once found myself placed among the “evangelical” attendees. In that group was someone who denied simplicity, impassibility, and the fact that God knows the future—all doctrines that I affirm. Those are not minor differences. Wistfully my eyes wandered to the Dominicans at another table, all of whom would at least have agreed with me on who God is, even if not on how he saves his church. We would at least have shared some common ground upon which to set forth our significant differences. The Reformed Orthodox of the Westminster Assembly would have considered deviance on the doctrine of God to be anathema and, if forced to choose, would certainly have preferred the company of a Thomist to that of someone who denied simplicity, eternal generation, or God’s foreknowledge. Why do we not think the same? The modern Protestant imagination is oddly different from that of our ancestors.
Are disagreements on theology proper -- like the ones mentioned on simplicity, impassability, eternal generation and God's foreknowledge -- more serious than disagreements on soteriology, such as justification?