William Lane Craig diagnosed.

[wiploc]

First, an example of Dunning Kruger syndrome, after which I'll disagree with your diagnosis of Craig. 

I knew this guy who worked as a carpet cleaner.

It's all relative, of course.  Compare yourself to that carpet cleaner and then do the same comparison between Craig and someone like Sean Carroll.  With respect to the latter, he is a professor of theoretical physics at the California Institute of Technology.  Craig was a communications major who went onto Bible college for his "graduate" studies.  Just do a comparison on the admission rates of Cal Tech and any Bible college.  Relative speaking, Craig is "unskilled".

But don't you think Craig knows that? 

Here's what he's good at: 
1. Making his followers feel like he has defended God well enough that they are vindicated. 
2. Obscuring the ways in which his relatively sophisticated god differs from their crude one, so that they can believe their god is the one he's been defending.

That's what he does.  That's what he's good at.  He doesn't pretend to himself that he knows theoretical physics better than Sean Carroll.