After all, I don't know how much value have rational reasonings to someone who believes in sky pixies.
Well, it's really not that hard to find. You can start by checking these freaks on Wikipedia: Renee Descartes, Blaise Pascal, Thomas Aquinas, Henri Bergson, C.S. Lewis, G.K. Chesterton, etc.
They are called computers simply because computation is the only significant job that has so far been given to them.