So, tell me: What if Jesus DID sin. Let's say he and Mary Magdalene rolled in the hay. What would the Big Guy in the sky do next? Zap Jesus? Take away his heavenship privileges? Let him grow old like Adam?
Also, would that be it for humans? Was it a one-shot deal?
God: "Dammit! Jesus poked Mary Magdalene. Now what do I do? CRAP! Oh, well. At least I tried. Good riddance, you filthy humans! I guess Satan was right."