Kalaam has never been a particularly compelling argument, for many of the reasons previously given, but now it faces an even more damning problem. Science has produced plausible hypotheses for how the universe can exist without the prior existence of a creator god. Even if none of these hypotheses is yet proven, or even ever proven, they introduce into the set of explanations as to how the universe exists a set of explanations which does not require the existence of a creator god. In that transition, God moves from being the only explanation for the existence of the universe into being merely one possible explanation among several. With that move, the conclusion of Kalaam ceases to be a necessary truth and instead becomes only a contingent one. If the existence of God, given Kalaam, is only contingent, the argument is no longer useful to the theist. It ceases to have any value in proving the existence of God, even if you could fix its problems.
A number of additional premises are hidden in the first premise, some of which need to be broken out for clarity.
1. uniformitarianism. (possible, but unlikely)
2. everything that began to exist has a cause. (assumed, but highly questionable given modern physics)
3. everything that exists began to exist. (again, questionable, especially at boundary conditions, e.g. Hawking-Hartle)
Oh, and Mystic, you need to stop telling people how the universe works. My observation of you is that you haven't the first clue how the universe works. FYI.