Part of that comes from IRL speaking with a pastor whose sermons I attended about the nature of the Trinity (Father, Son, & Holy Ghost), and noticing that in most versions of the Bible the Lord occasionally speaks in first person plural.
Genesis quotes from
an online Bible:
1:26. Then God said, "Let us make mankind in our image, in our likeness..."
2:22. And the Lord God said, "The man has now become like one of us, knowing good and evil."
It's not all the time, but occasionally.
That said, neither Renka nor Jimmy are professionally educated in theology, and what Jimmy said was mostly repeating what he thought he remembered from this incident at the nightclub, not what he was taught in Sunday School.