Final answer:
The Apostle Paul greatly influenced the development of Christianity by popularizing the belief in Jesus's crucifixion as part of a divine plan.
Explanation:
The Apostle Paul greatly influenced the development of Christianity. As a former Jewish leader, Paul transformed and popularized the belief that Jesus's crucifixion was part of a divine plan to redeem humanity from sin. His decision to spread Christianity beyond Jewish communities into the Greco-Roman world was a pivotal moment in early Christianity.
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