Can anyone explain why CS Lewis's trilemma argument is convincing to so many people?

In many places I often see CS Lewis's trilemma pop up and people seem to think it's a very persuasive argument. But I don't understand why. It's often framed like this: 'Jesus must be one of three things: 1) A demon who was misleading people on purpose, 2) delusional, 3) the son of god. The argument is that since we can see from the historical record that Jesus taught with an authenticity and didn't seem to be crazy or misleading people on purpose he must be the son of god. <br><br>I don't understand why this is persuasive. Why can't he just be a charismatic religious leader who is sincere? Why is it a trilemma? Why would he have to be one of those three choices? It seems like he could very easily be none of those things.