Well they are wasting their time and money. Evangelizing the world will happen if God wills it to happen. If on the other hand God determines that next Tuesday at 12:01PM EST is the end of His patience with man, then that is the end and the next stages of prophesy begins. That has always been the problem with man. He believed it in the garden when the devil offered him the chance to be like God. It was a lie. Adam bought it and sin entered the world. Since then man has believed he can manipulate God into doing it man's way. It's not going to happen any other way but God's way. And to that I say Hallelujah.