There is a long history of arguments for God's existence offered by the faithful - the cosmological, the teleological, the ontological. As means to the conversion of atheists I find these arguments nearly useless, because I knew them quite well as an atheist without ever being compelled to reverse my atheism.
This episode is a clarion call to Christians, as Paul put it, "to stand," having faith in God's truth and power. Faith results in action; it cannot help to do so. Trust that The Way is Truth for all men. Proclaim Him, think clearly, be honest, acknowledge what you don't know.