In the name of Jesus, Here it is the Sunday of the Reformation and the people of God have gathered as Christ's disciples to hear his voice and receive his testament. The fact that Christians still come together in this way after two thousand years testifies to the power of God's truth.
Every human group changes over time.
Organizations come and go. The church of Jesus Christ shall remain forever. That is because Jesus Christ is actively calling people to be his disciples in every age and generation. The Church remains because it holds to Christ's teaching above all other things. Reformation is not a time for boasting about ourselves.