The Qur’an is a very concise book. You do not find unnecessary or superfluous detail in its verses; the information that it contains always serves and supports the overall purpose of the Qur’an which is guidance for mankind. By contrast the Old Testament provides a lot of unnecessary, and arguably harmful, detail that is of no benefit to those seeking guidance. A good example is Ezekiel 23:20, which describes the genitals and semen of men using obscene language. The New Testament suffers from a lot of repetition, for example the Gospels of Mark, Matthew and Luke contain so much duplicated material between them that it has led many Christian scholars to conclude that their authors used a common source which has since been lost to history.
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Christian theology teaches that the only way mankind can attain salvation is through the Crucifixion of Jesus. According to the New Testament, the death of Jesus echoes the blood sacrifices that were part of the Mosaic Laws of Atonement in the Old Testament. Blood sacrifices are apparently needed in order to cleanse us of our sins because God cannot just forgive sins without some form of penalty. Therefore Jesus was a substitute for mankind in that he took our place, suffered our punishment and ultimately paid the penalty of sin on our behalf, thus reconciling us with God. The writings of Paul in particular heavily support this dogma:
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