Do you believe in Jesus Christ?
Yes. I believe in one Lord, Jesus Christ, the only Son of God.
Catechism for the Global Methodist Church, question 7
7And a cloud appeared, overshadowing them, and a voice came from the cloud: "This is my beloved son; listen to him."
17And behold, a voice from the heavens said, "This is my beloved Son, in whom I am well pleased."
16For God so loved the world that he gave the unique son, in order that everyone who trusts in him should not perish but have eternal life.
36Let all the house of Israel therefore know for certain that God has made him both Lord and Christ, this Jesus whom you crucified.
9That if you confess with your mouth the Lord Jesus and trust in your heart that God raised him out from the dead, you will be saved.
6yet for us there is one God, the Father, from whom are all things and we exist for him, and one Lord, Jesus Christ, through whom are all things and we exist through him.
11And every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.
4For certain people have slipped in secretly, who long ago were designated for this judgment, ungodly ones who turn the grace of our God into debauchery and deny our only Master and Lord, Jesus Christ.
The catechism now turns to the second article of the Nicene Creed, and it begins the way it began with the Father: a candidate is asked whether he believes, and answers in the first person with the creed's own words. "I believe in one Lord, Jesus Christ, the only Son of God." Article II of the Confession of Faith calls him "the only begotten Son of the Father," and ΒΆ102 of the Book of Doctrines and Discipline sets Romans 10:9 at the center of the church's proclamation: "if you confess with your mouth the Lord Jesus and trust in your heart that God raised him out from the dead, you will be saved." This question is that confession in the mouth of a member.
The only Son of God is what the Father himself said. At the baptism a voice from the heavens declared, "This is my beloved Son, in whom I am well pleased" (Matthew 3:17), and on the mount of transfiguration the voice from the cloud added a command: "This is my beloved son; listen to him" (Mark 9:7). John describes him as "the unique son," the Son of whom there is no other, given by the Father so that "everyone who trusts in him should not perish but have eternal life" (John 3:16).
One Lord is the title the apostles gave him after the resurrection. Peter's first sermon ended with it: "God has made him both Lord and Christ, this Jesus whom you crucified" (Acts 2:36). Paul places Jesus beside the Father in the confession of Israel: "for us there is one God, the Father, from whom are all things and we exist for him, and one Lord, Jesus Christ, through whom are all things and we exist through him" (1 Corinthians 8:6). The hymn of Philippians 2 looks forward to the day "every tongue should confess that Jesus Christ is Lord, to the glory of God the Father" (Philippians 2:11). Jude shows the negative: false teachers are known because they "deny our only Master and Lord, Jesus Christ" (Jude 1:4).
A Methodist says this line with the whole church at every baptism and confirmation, and Wesley expected it to be said with what he called the faith of a son rather than the faith of a servant: the trust of a child in a living Lord. Romans 10:9 joins mouth and heart. The confession spoken in worship is meant to be the trust that carries a person through the week.