I can’t add anything. " Between the 9th to 12th centuries, the cosmological argument developed as a concept within Islamic theology. It was refined in the 11th century by Al-Ghazali The Incoherence of the Philosophers, and in the 12th by Ibn Rushd (https://en.wikipedia.org/wiki/Kalam_cosmological_argument#cite_note-14)
It reached medieval Christian philosophy in the 13th century and was discussed by Bonaventure, as well as Thomas Aquinas (https://en.wikipedia.org/wiki/Thomas_Aquinas) in his Summa Theologica and [Summa Contra Gentiles].(https://en.wikipedia.org/wiki/Summa_Contra_Gentiles)
And this is the very best the modern Christian theologians can offer us. It’s sad. So very sad.
As far as Craig’s second part to the argument, I have seen Blue universe creating bunnies, Rainbow farting unicorns and Big yellow universe creating bananas argued just as successfully.
Craig does nothing but point to a gap that HE creates… (We don’t actually know anything about the origin of the universe and causality breaks down at Planck time). So he creates a gap based on causality and then inserts his version of God into the gap., UTTERLY and COMPLETELY fallacious.