You suck at research…
1 Corinthians 15:7 specifically names James as one to whom Jesus appeared after His Resurrection. Seeing his dead brother walking and talking, James believes that Jesus is the Christ, the Son of God sent to save people from their sins.
When he later writes the Epistle of James, he introduces himself not as the brother of Jesus or a leader of the church but as simply, “James, a servant of God and of the Lord Jesus Christ” (James 1:1).