Challenge on impeccability < blog.zerodeviation.net

The last topic of the Roundtable was that of Christ’s impeccability. Could he have sinned? The dilemma, obviously, is that as 100% human, he could have, but as 100% God, he couldn’t have since God cannot sin. So what’s the answer?

There are several views on why he couldn’t have sinned – which is also my position – and a good systematic theology will explain why. However, one argument I have never seen presented, probably due to its being totally false nonsense, is the following. And yeah, I came up with that all by myself.

God declared the Messiah would take the sins of the world
For that to happen the Messiah needed to be without sin
If there were a possibility for him to sin, there must have also been a possibility for God to be wrong in his declaration
God is never wrong
Therefore, Jesus could not have sinned

This is probably the most clumsy presentation of a logical argument, so please bear with me. I would really like to know where the error lies.

Edit: I think it boils down to this: If the bible said years ago I would get married on September 20, 2003, come that time, could I have chosen otherwise? It couldn’t have possibly happened otherwise because God already said it would.
I tend to think that yes, I could have chosen otherwise. It’s another example of God’s sovereignty and human freedom. I guess I answered my own question. It always helps to formulate it as a question to others; I seem to learn really well that way.