What central doctrine of early Christianity became the basis on which believers proclaimed Jesus as Christ?

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The belief in the Resurrection of Jesus Christ became the central doctrine of early Christianity and the basis for proclaiming him as the Christ. It signified his victory over death and confirmed his divine status as the Son of God. This belief was so fundamental that St. Paul wrote, "If Christ has not been raised, then our preaching is in vain and your faith is in vain" (1 Corinthians 15:14).

What Central Doctrine of Early Christianity Became the Basis on Which