This may look like nitpicking, but I want to correct your wording here. The premises aren't about something having a beginning, rather its about the existence of something having a beginning. As irrelevant as it may sound, terminology is very important here. So to correct:
- Everything that begins to exist has a cause
- The universe began to exist
- Therefore, the universe has a cause
TranzzistX by inclination I try to avoid these types of abstract debates nowadays, and I have a soft spot for Christianity thus no intention of trying to dissuade you from your faith, but I am bored so let me point out the ultimate dilemma of the cosmological argument - it presupposes rationalism.
One of the oldest discussions in philosophy concerns the relation of reason to the world, there are three enduring schools of thought, rationalism, empiricism and the Kantian philosophy. The cosmological argument crumbles in the later two frameworks.
If you are an empiricist (I personally am most sympathetic to this), there is no way to establish causality - a succession of experiences does not amount to the experience of that succession. What you and I see around us are correlations of events, though we can conceptualize causality (that is, we can imagine the connection of those events by necessity), there is no way to directly observe it, and therefore, no way to prove it if we take the faculty of reason to proceed the world.
Causality and even the 'laws' of logic, in this view, are merely abstractions only certain in the mind, although they are inferred from experience - in regards logic for example, we already know that propositional logic, which is basically what all theological arguments are grounded in, fails to describe some experiences - in quantum mechanics, the distributive law (p ^ (q v r) = (p ^ q) v (p ^ r)) breaks down, to give a concrete example.
If you think you are a Kantian - I recall once you adducing Immanuel Kant in a thread - you might be surprised then because the man himself repudiated the cosmological argument.
In the Kantian system, space and time are what he himself called 'forms' by which we perceive things in reality. Neither space nor time are sense perceptions (however they do give particular form to those once they are ordered by the mind) but they are not concepts learned either - all experience must be structured in them for time is continuity and ordering of experience, space is its appearance. Since space and time are modes of 'understanding,' if there exists anything outside the limitations of our experience, these need not need to be constrained by them, and therefore neither concepts are applicable to reality outside our experience of reality.
Further, causality is a 'category,' a 'pure' concept of 'understanding,' which in the Kantian parlance means it does not refer to experience but are concepts on which empirical phenomena are structured. But once again, this means that this too, is not necessarily a part of reality outside of our experiencing it.
Space, time and causality are not necessarily an aspect of what that guy termed 'things-in-themselves.' Outside our mind, whatever there is is not necessarily bound by any of those things - ergo speculations about God or whatever 'before' the Big Bang are utterly meaningless.
Or something like that. Frankly I am not sure if I even understand Kant. But see now why some Christian theologians were actually hostile to Kant and his philosophy?
Finally even within the rationalist tradition there have been objections to the Kalam but I personally find those objections far less problematic than empiricism or the Kantian philosophy - the former (empiricism) is fatal to pretty much all theological arguments for God and the later concords only with relatively uncompelling arguments from morality (which is what Kant himself based his belief in God on).
Summary of it all?
The Kalam cosmological argument is contingent on the worldview of philosophical rationalism, so you better first try to convince us of that before you tout the Kalam - and good luck with that because it's been thousands of years and I think far fewer informed thinkers subscribe to it than they once did.