There are those who advocate the heresy that God loves all mankind. The Protestant Reformers did not hold to such irrational and contradictory theology. They were trained in logic and understood that Scripture does not contradict other Scriptures. Instead they advocated the principle of sola Scriptura or "Scripture alone" as the final authority in all doctrinal disputations. That being the case, the Reformers held that Scripture interprets Scripture. The whole counsel of God is to be consulted in the interpreting of propositions in Scripture. The Scriptures can be systematically organized into a system of theology. That systematic confession of faith for the Puritans in England was the Westminster Confession of Faith. As the late Dr. Gordon H. Clark said, Calvinism is Christianity. Clark boldly defined Christianity by the systematic exposition of Scripture in the Westminster Confession For Clark the Bible is the very words and thoughts of God in propositional form. Scripture is univocally the very words of God in written language.
For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness, 19 because what may be known of God is manifest in them, for God has shown it to them. 20 For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse, 21 because, although they knew God, they did not glorify Him as God, nor were thankful, but became futile in their thoughts, and their foolish hearts were darkened. 22 Professing to be wise, they became fools, 23 and changed the glory of the incorruptible God into an image made like corruptible man-- and birds and four-footed animals and creeping things. 24 Therefore God also gave them up to uncleanness, in the lusts of their hearts, to dishonor their bodies among themselves, 25 who exchanged the truth of God for the lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen. (Romans 1:18-25 NKJ)