re: What does it mean that God gave them over to their sins?

quote:

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You either have Union with God or Union with sin, so man chose sin and God "gave them up."?

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Pretty good synopsis in very general terms BUT in Romans 1 he's talking about the progression of rebellion, starting with one generation that was not thankful (good Thanksgiving sermon).
He's not referring to all mankind here, but to worst unregenerates of humanity. "He gave them up" to destroy themselves in their sin and God would show no more mercy.