The relevance of the Church is not dependent on its ability to strategically adjust its message to pertain to what the world is concerned about. Rather, the Church only needs to concern itself with being relevant to ground of all reality, God himself in Christ. Inasmuch as it does this, what the Church has to say is by definition the most relevant thing that can be said.
Psalm 2 describes an idealized Israelite king as God’s Messiah. Jesus radically reinterpreted this idealization when he chose to exercise his Messianic authority through service, self-sacrifice, and trust in God. The Church, as co-heirs with Christ, now share in the Messianic privileges and responsibilities.