God has the means, and ability to kill any or all of us, at his whim.
Why would he need to use any of us as his "instrument"?
Just like offerings at church, God has no need for money, or people to do his bidding when it comes to killing.
God doesn't need us. We need him.
And that, ladies and gentlemen, is what is wrong with a religion which demands that its members carry out "the will of god" to hurt their fellow man. It requires that someone speak for God. Again, if God wants us to know or understand something, he will make his will undeniably clear--in a way that can NOT be misconstrued by anyone to mean anything else.