I have to disagree, Marc. Most of the early (pre AD 60) churches, such as those in Ephesus, Thessalonica etc, did accept Paul as one of the messengers of the gospel. If there was any argument about Paul's authority, it was over whether or not the gospel was meant for the Gentiles as well as the Jews.
Yes, the Gospels (and the rest of the NT) were written after Jesus's death, but the gospel writers were all eye witnesses of His ministry. Speculation here, it wouldn't surpirse me if Luke (the Dr.) kept a journal, seeing how specific he was in his writing.
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