Does 1 Corinthians 8:6 include Jesus in the Shema?

1 Corinthians 8:6 shows that God is the Father alone. Trinitarians counter by saying that Jesus is God because (1) He co-created with God, (2) “God” and “Lord” are synonyms, and (3) this verse divides the words of the Shema between the Father and the Son.