yet for us there is but one God, the Father, from whom all...

yet for us there is but one God, the Father, from whom all things came and for whom we exist. And there is but one Lord, Jesus Christ, through whom all things came and through whom we exist.
One God, one source, as Jesus comes from God, no issue whatsoever

In 1 Corinthians 8:6, the term "Lord" (Greek: "κύριος," kyrios) signifies authority, divinity, and sovereignty.

In the context of "one Lord, Jesus Christ," it highlights several key points regarding Jesus' relationship to God the Father:  the Greek text includes the word "εἷς" (heis), which translates to "one" in English. The verse speaks about the oneness of God and the relationship between Jesus Christ and God the Father. The full verse emphasizes that there is one God, the Father, and one Lord, Jesus Christ.

Referring to Jesus as "Lord" emphasizes His divine status and authority. In the early Christian context, calling Jesus "Lord" indicated recognition of His position as the Messiah and divine Son of God.

In the verse, it is significant that Paul contrasts "one God, the Father" with "one Lord, Jesus Christ." This establishes a relationship where Jesus is recognized as distinct from the Father yet fully divine, indicating the Christian belief in the Trinity—Father, Son, and Holy Spirit.

In the Jewish tradition, "Lord" was also a title reserved for God, particularly in reference to YHWH. By using this title for Jesus, the text connects Jesus to the God of Israel, affirming His essential role in the faith and the fulfillment of Old Testament promises.

By affirming Jesus as "one Lord," Paul underscores the centrality of Jesus in Christian faith, worship, and practice, reinforcing that belief in Him is foundational to the identity of the Christian community.