William Lane Craig (born August 23, 1949) is an American evangelical Christian theologian and philosopher. He is currently a research professor of philosophy at Talbot School of Theology, Biola, a private Christian university in southern California. He is a good speaker and is well known for appearing in debates championing the existence of God. In this youtube clip he sets out his arguments. Some of them could be taken straight out of a TOK textbook while I feel that others are rather circular arguments and have premises based in his own faith. I do, however, think this clip makes a nice starting point for a discussion on this topic, whatever your own position is:
