
Compare Luke 8:19-21; John 15:14
The disbelief of Jesus’ immediate family makes the apparently post-resurrection conversion of his half-brother James (to whom, according to 1 Corinthians 15, the risen Lord made a separate, special, and personal appearance) all the more impressive.
Plainly, something happened that turned James into the pillar of the church at Jerusalem — and the eventual martyr — that he rapidly became.
I suspect that Easter morning had a great deal to do with his transformation. And his transformation is evidence for the fact that something decisive happened on that morning, nearly two thousand years ago.