What is a sin nature? Jesus was tempted by the devil. Why was he tempted? It's because Jesus was flesh and flesh is prone to sin, but Jesus fid not committ sin even though tempted. It's his example to us as I stated. So, being in the flesh as we are he was likewise tempted as we are. What's your point?
There are no scriptures that say what you're implying. Nor do the ones you've quoted. The fact is Jesus was tempted by the devil, unsuccessfully. But that doesn't mean he swallowed the devils bait and sinned? No he did not. And yes, therefore, God cannot be SUCCESSFULLY tempted. But Jesus was in the flesh and being in the flesh was as vulnerable as anyone, yet he did not sin, unlike us who all have and was in fact without spot. He is our example.