One of my favs is Richard Carrier and he will regularly run online courses in topics related to the Great Debate. Anyways, he is having a Counter-Apologetics course in January which teaches you how to tackle the arguments against God. I think John Shook is involved, too (in an email about Carrier's previous course on the topic Carrier mentioned that the upcoming one would have Shook helping him with the content).
The course will also cover Muslim apologetics, something I was interested in and I'm sure to enjoy as well.
The course is big on Bayes arguments but after a brief look over the course website I was hoping for more information on the art of speaking or debating persuasively. The required text, Atheist Primer reads well so far.
Well yeah so it was suggested to me to summarize my experiences with the course and I hope I can do that here. It costs 60 bucks if you all want to join so check it out!