...[W]hat I'm skeptical of is how many people here have heard a religious argument that actually made them think, one that has a chance in a real debate.

A-causal blackmail, once I thought deeply about why it might be scary. Took about an hour to refute it (to my satisfaction) - whether it would have a chance in a 'real debate': debate length, forum, allotted quiet thinking time and other confounds make me uncertain of your intended meaning.