On the claim that without God, we have no morality.

Yeah, I have watched William Lane Craig's videos, and every time  I saw his videos, his unwarranted assumptions, illogical conclusions and ignorance managed to irritate me. How come a person like that could get a doctorate and have the honor to debate with 'real' doctors like Richard Dawkins or Christopher Hitchins?

Basically he repeats something like this every time.

Without an absolute moral giver, all things are subjective. If so, we cannot tell which are good and which are evil, thus we cannot have morality.

OK. So, without God, people don't know good and evil, eh? Fine. How can you be sure about 'God' being good? Tell me why it is impossible that your 'God' is actually evil? Since people cannot tell good from evil, all people can do is to believe whether he says about him being good or evil, right? What if an evil God claims that he is good? How can we know he is actually good? We can't tell good from evil, by your presumption. What, you want to claim he is good because he made the universe and mankind? First, that is your human assumption and since you are a human, by your assumption that is subjective and you cannot decide he is good or evil. Secondly, why can't evil god make the universe? A psychopath can raise dogs just to hurt them later. Like that, an evil god could create the universe and mankind just to harass them.

Take that, William Lane Craig.