While the storm churns through Texas and Louisiana, causing floods, death and misery, it is time to consider the damage the prosperity gospel has done to America. Mr. Trump and Mr. Osteen unwittingly revealed its ugly underbelly: the smugness, the self-aggrandizing posturing. It has co-opted many in the Republican Party, readily visible in their relentless desire to strip Americans of health care, disaster relief and infrastructure funding. The survivors of Hurricane Harvey do not need empty tweets and platitudes from people like Donald Trump and Joel Osteen. They have shown beyond a shadow of a doubt that, as we say in Texas, they are all hat and no cattle.