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.
"All we are given is possibilities -- to make ourselves one thing or another." -- Ortega y Gasset