When the Gospels and Acts of the Apostles were written, the Catholic leaders of the day decided to add what we now call the "Old Testament" and create what we now call the Bible. They did this for a number of reasons and here are a few. Most Catholics during the first century AD were also jews. The Old Testament is a history of the jewish people and it made sense to add their history to the teachings of Christ. After all, Christ was raised as a Jew. The Old Testament also gave the Gospels a historical context of who God was and what he demanded of us. But the New Testament is the New Covenant between God and humanity. It supersedes the teachings of the Old Testament. Here's an example. The Ten Commandments in the Old Testament specify that - you shall not kill. But why not? Because God commands it. But Christ tells us to - Love One Another. If you truly love your fellow man then you would never even think about killing them.
Remember that Christ the cornerstone of the Catholic Church. The New Testament defines the life of Christ and the teachings of Christ. Therefore, it supersedes and often contradicts some phrases of the "Old Testament". We Catholics have no quarrels with the teaching of evolution in schools eventhough it contradicts creationism in the Old Testament. In fact, I learned about evolution while attending a Catholic elementary school from Nuns.
We Catholics clearly understand that God made us in his own image and that we should live a life free of sin. And we also know that the Christ is the New Covenant between God and man, and that understanding comes from the New Testament and not the Old Testament.
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