Earlier quoted context omitted.
> I got a strong feeling that Lewis' arguments and exposition were guided by something other than logic, though they pretended to be following it. The trilemma is an example of this. One way to discover that we necessarily have worldviews outside of logic is to look at a statement like this, and realize it appeals to something outside of logic (feelings) to critique how someone else is only pretending to follow it.
I am not saying that I or anyone am perfectly logical or uninfluenced by feeling. Hume was exactly correct when he said the reason is the slave of the passions. But - with his trilemma, Lewis claims "here is a logical argument for believing in the Christian god", and then presents a weak and illogical argument. It's difficult to know what to make of this except that Lewis was somehow blinded to the logical flaws.
That is definitely not the point of the trilemma. It simply argues that Christ must be placed into one of three categories, which do not include "generally nice and completely harmless moral teacher". He was clearly claiming to be God, which obviously leads to the trilemma of choices between Liar, Lunatic and Lord.
That doesn't say which one of those three to pick. Just ruling out the other possibilities by considering the claims he made about himself.