it's not that he couldn't, it's he shouldn't have had to. He gave humans free will, when Satan deceived Eve it was a test and they failed and God altered the plan. Because he loves us so much and hates sin, there was no choice but to send Jesus Christ to die for our sins because God cannot be associated with sin.
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You cannot claim "there was no choice". An omnipotent being, by definition, could do anything in any given situation.
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But you don't understand, he went in with full knowledge that they would fail, almost like he wanted us to be mortal.