One of the biggest things The Da Vinci Code gets right about religion is the fact that, for many years, no one could agree on what the "Bible" was supposed to be.

According to History, the first known attempt to create a canon happened in second-century Rome. However, Marcion, who tried to assemble the Gospel of Luke and Paul's letters into a single document, riled up church leaders so badly that he got expelled. The Muratorian Canon, one of the closest things to the modern New Testament, was probably collected in the third century. It wasn't until the fifth century C.E. that most Christian churches finally agreed on a Biblical canon, nearly 500 years after the crucifixion of Christ.

The fourth and fifth centuries were especially turbulent for the church, Britannica reports. In the 300s, there was Arianism, which claimed that the human Jesus couldn't be one and the same as God, causing the Council of Nicaea to work itself into a frenzy. Questions over the exact nature of Christ also led to the Christology controversy in the 400s. Essentially, Christology, which came in different variations and intensities, pushed the still very controversial idea that the human Jesus wasn't as fully divine as others in the church wanted him to be. Even today, different denominations of Christianity are still busy arguing over doctrinal differences, much like their religious forebears.

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