The relevant portion of the Bild.com interview:
BILD: Do you believe in God?
Brad Pitt (smiling): “No, no, no!”
BILD: Is your soul spiritual?
Brad Pitt: “No, no, no! I’m probably 20 per cent atheist and 80 per cent agnostic. I don’t think anyone really knows. You’ll either find
out or not when you get there, until then there’s no point thinking