Dr. Craig is a liar.

[SteveII]

Because if there is a God, it is a metaphysical necessity that he have the property of always existing. If he failed to have that property, he would not be God. 

The "cosmos" does not have that property. It logically could have failed to exist. This is exactly what Carroll said in the video that you posted.

How do know this, that this, the cosmos does not have this property, one of a necessary existence?  Can you provide the "logical proof" that the existence of god is necessary?  If god exists, could god have made 2+2 = 5 a true statement?

You are confusing the property of necessarily existing with logically existing. That is not the point here. Again: if there is a God, it is a metaphysical necessity that he have the property of always existing. If he failed to have that property, he would not be God.

If you think the cosmos necessarily exists (could not have failed to exist), you make your case.