William Lane Craig gave an amusing but persuasive lecture in which he "Eastwooded" Richard Dawkins (embedded below). The argument rehashed arguments for the existence of God, such as the cosmological argument and the ontological argument.
Some of these, like the cosmological argument, are so airtight that one really wonders how some atheists continue to reject them. One possibility is that the arguments are too strong. Atheists think it can't be that easy, and that they must be being tricked. There must, they think, be some flaw in the argument that just has not yet been appreciated.
I would add that those arguments are valuable, but they are not enough. Acknowledging that God exists and created the world is not enough to escape God's wrath. One must repent of one's sins and trust in the Son of God for salvation from sin.
Craig's good, but incomplete, presentation is embedded below: -TurretinFan