I am a Christian, but I would agree with the atheists here that this was not a good argument that you came across. However, academic Christians such as William Lane Craig do have pretty good argument. If you start the video below at 4:30 and watch for a few minutes you can see at least one.
http://www.youtube.com/watch?v=Ssq-S5M8wsY
http://www.youtube.com/watch?v=Ssq-S5M8wsY