It is important to understand that W. L. Craig presents arguments in one way to popular audiences (i.e., inaccurate, overly-simplistic, and/or obviously wrong) and another in his scholarship. He even wrote a technical critique of the physicists he has relied on in popular works to promote the popular version of his kalam argument and others he uses to reach the same conclusion. He's simply dishonest, and I've seen the results of this here when those relying on his popular presentations (spoken or written) find themselves confronting the actual logic and reasoning he uses when addressing any audience whom he knows won't buy such simplistic drivel.