We exist to glorify God by knowing Christ and making Him known. That's it. That sentence drives our lives and our church ministries.
God created us to glorify Him (Isaiah 43:7), so everything we do is centered around Him. This is the Great Conclusion.
The best way we glorify God is through knowing Christ by faith in His life, death, and resurrection on our behalf. To know someone is to love them, which is His Great Commandment (Matthew 22:37).
We also glorify God by making Him known to our neighbors and to the nations. This goal is His Great Commission (Matthew 28:18-20).