I'm not sure I follow your objection, but we are to treat the Word of God as the Word of God. The original post clearly implies that God should have "chosen" godly people. The gospel is precisely that "Christ died for the ungodly" and God's grace toward the ancient Israelites despite their persisitent ungodliness was an object lesson for the rest of us (who are also ungodly) so that "every mouth may be stopped."