How Could the Earth Have Contained Everyone If Sin Hadn’t Entered the World?
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Since the scenario you are envisioning did not happen, we have no biblical basis for an answer. Your question also implies that the world, as it is now, is a sort of Plan B. It’s easy to think that because we know God hates sin and yet, because we know He is both sovereign and omniscient, there is no other way for the world to be right now.
