Well, I'd maintain that there is in fact a debate to be had on the subject of the existence of God, it's not a foregone conclusion. And Craig, though he is a sophist, does not need to debate Dawkins to give himself credibility. He's debated many atheist thinkers and philosophers who are far better at defending atheism on a philosophical level. And, I suppose Craig has two Ph.D.s or something like that.
It works like this
Step 1
Debate: Existence of God
Conclusion: Nobody can disprove god, or prove how the universe exists without god.
Step 2
Debate: How did we get here
Conclusion: Nobody can explain how life started, and nobody can prove god *didn't* guide evolution.
Step 3
Tell children "Look, there is so much debate about god and evolution; this wouldn't be going on if they could prove their position! Now use your 'common sense' and you will see what the truth is."
Check mate.