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I forgot to mention that it would also be a good idea to read the writings of St. Augustine of Hippo against the error of the gnostic sect of the Manicheans - related to the more ancient one of Marcionism. Their vision of God is wrapped up in the following words attributed to the founder of that group, Mani:
It may be of some comfort to know that St. Augustine himself - a Doctor of the Church - for a long time held these ideas. He eventually learned the truth (that is, found the error in those teachings) and this is how he briefly describes it in his Confessions:The devil god which created the world was the Jewish Jahweh. It is the Prince of Darkness who spoke with Moses, the Jews and their priests. Thus the Christians, the Jews, and the Pagans are involved in the same error when they worship this God. For he leads them astray in the lusts he taught them. Now, he who spoke with Moses, the Jews, and the priests he says is the archont of Darkness, and the Christians, Jews, and pagans are one and the same, as they revere the same god. For in his aspirations he seduces them, as he is not the god of truth. And so therefore all those who put their hope in the god who spoke with Moses and the prophets have (this in store for themselves, namely) to be bound with him, because they did not put their hope in the god of truth. For that one spoke with them (only) according to their own aspirations.
And Lactantius, Christian author of the III Century called by some the “Christian Cicero”, wrote in his * Divine Institutes*:With great eagerness, then, I fastened upon the venerable writings of thy Spirit and principally upon the apostle Paul. I had thought that he sometimes contradicted himself and that the text of his teaching did not agree with the testimonies of the Law and the Prophets; but now all these doubts vanished away. And I saw that those pure words had but one face, and I learned to rejoice with trembling.
I also found a nice post on this very topic by senior apologist Jimmy Akin of Catholic Answers here.All Scripture is divided into two Testaments. What preceded the advent and passion of Christ’that is, the law and the prophets’is called the Old [Testament]; but what was written after his resurrection is named the New Testament. The Jews make use of the Old, we of the New. Yet, they are not dissonant. The New Testament is the fulfilling of the Old, and in both there is the same testator, even Christ who suffered death for us and made us heirs of his everlasting kingdom.