Why is Bart Ehrman going through this argument when elsewhere he concedes the early creeds go right back to the cross at 33 AD?

Agnostic New Testament scholar Bart Ehrman both freely and often dates the earliest of these creeds to the 30s AD, sometimes within just 1-2 years after the crucifixion!Bart D. Ehrman, Did Jesus Exist? The Historical Argument for Jesus of Nazareth (New York: Harper Collins, 2012), see pages 22, 27, 92-93, 97, 109-113, 130-132, 141, 144-145, 155-158, 164, 170-173, 232, 249-251, 254, 260-263; cf. 289-291.

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