God's existence that keeps getting trotted out. If there is a God and prayer works then why doesn't God heal amputees? This audio answers the question by giving seven erroneous presuppositions on which the argument is based and why they don't make sense. Brian posts a link to the audio and to the text answer.
Apologetics 315: Why Won't God Heal Amputees? MP3 Audio from GotQuestions.org