How does the execution of Jesus take away our sins?

God sent his only son to die on the cross for our sins, or so the story goes. Was God really sacrificing anything? I mean, if Jesus is God in the flesh, and when he died he returned to his father... this would be more like me sending my son on a camping trip. And exactly how did our "sins" get... show more God sent his only son to die on the cross for our sins, or so the story goes.

Was God really sacrificing anything? I mean, if Jesus is God in the flesh, and when he died he returned to his father... this would be more like me sending my son on a camping trip.

And exactly how did our "sins" get taken away when he died on the cross? Why couldn't God just do this automatically and tell us it was done. Why waste the time and energy to send Jesus?
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