I have a hard time believing God responds to challenges. He does whats in his plan for us, despite what people may say about him. They yelled at Jesus to get down off the cross if he could. He couldve, but thats not what he was there for. I personally wouldnt challenge God, because I know hes obviously capable of turning me into a speck of dust in an instant and because Im a Christian and I wouldnt bad mouth my God, but I dont think he would turn me into a speck of dust. Just another example of his patience and willingness to give us another chance.