God is One and He gives us one statement of faith to believe, preach, and live. There is one baptism, not referring to water baptism, but to the baptism of the Holy Spirit where He united believers to the Church. And this One God manifests Himself as Father, to His Son and to all His children. Once again Paul is emphasizing the reason for calling believers to live and act as one body in Christ. We don't serve a God only linked to one denomination or another. We serve One God who has called us into His one family and gave us one salvation good for all who believe, Romans 1:16. That we have one faith deals with the teachings we find in His Word, 2 Timothy 3:16, that instructs us and equips us to live righteous lives in this world, 2 Timothy 3:17. May God help us to renew the unity within the Body of Christ that will bring Him joy and will fulfill His will.