Dr. William Lane Craig is a research professor of Philosophy at Talbot School of Theology in La Mirada, CA. Though a Protestant, the following debates are orthodox theism so no Catholic worries. As for arguments for the existence of God, I am of the opinion that his Kalam argument is as strong as we've seen since Aquinas' 5 ways.

Craig vs. Frank Zindler 1993 debate on Atheism versus Christianity MP3

Craig vs. Peter Atkins 1998 debate on the existence of God MP3

Craig vs. Keith Parsons on Why I Am / Am Not a Christian MP3

Craig vs. Brian Edwards radio debate on the existence of God MP3

Craig vs. Austin Dacey 2005 debate on the existence of God MP3

Craig vs. John Dominic Crossan 1995 debate on the historical Jesus MP3

Craig vs. Gerd Ludemann 1997 debate on the Resurrection MP3

Craig vs. Brian Edwards radio debate on the Resurrection MP3

Craig vs. Hector Avalos 2004 debate on the Resurrection MP3

Craig vs. John Shelby Spong 2005 debate on the Resurrection MP3

Craig vs. Jamal Badawi debate on Islam versus Christianity MP3

Craig vs. Ray Bradley debate on God and Hell MP3

Craig vs. Eddie Tabash 1999 debate on Secular Humanism versus Christianity MP3 (poor recording quality)