the way I look at it is this: There must be some sort of notion of something existing forever, something that had no beginning. Ya, sounds odd, but I think it is necessary. If the universe was created by two colliding branes, then how did the branes get there but from previous brane collisions ad infinitum? If LQG concludes that the universe existed in a "negative" form leading up to the big bang, don't negative numbers also go off to infinity? If there is a finite timespan of the universe in both directions in time, then the universe oscillates back and forth forever. If the universe had a definate beginning out of nothing at all, then you can say that God created it out of nothing because he has the power to do so by definition, and also by definition, God had no biginning either. So whether you believe in God or not, the way I see it, you must believe that something (God or the universe<--not what happened from the BB, but pre BB theories) had no beginning.
Although I have my own theory. The universe has existed forever, but God put it there. The big bang is continuously occurring, and it is the only "white hole"--meaning the opposite of a black hole--in the universe. The singularity of the BB is multiply connected to all other singularities in the universe (which are black holes), and all particles are singularities with even horizons. General relativity is a statistical distribution theory which averages out all the singularities in a given frame. Black holes as we know them today are thought of as copiously massive things, but I think it's all relative when you change your frame to look at a single particle on a small scale, it would look pretty much the same. The Einstein-Rosen bridge was an attempt to apply GR to an electron, and the solution was a multiply connected singularity, my only change is that all particles are multiply connected to the same thing, the BB. Therefore space-time flows into all particles and flows out of the BB. You may notice that I say it "flows", well that's becuase I've given space-time the same property as the Higgs field, and that means we deal with vector fields rather than scalar fields, so we can speak of gravity as an accelerating flow of space-time toward a singularity. We are in a part of the universe that has been coasting away from the BB for some time now, but we're traveling along in our local space-time frame that was emmitted from the BB, so it seems as though the BB happened a long time and distance ago, but it is still occurring, and we are closer to the BB than we think, in fact, we are made of particles, so we are "touching" it. of course, at the event horizon, light could orbit forever, and on the quantum scale, that's how I see things. An electron is a space-time singularity, and there is a single stable configuration for an electric field to orbit, and due to Maxwell's induced current, a balled up electric field is essentially a stationary charge, and since it is "orbiting" it has a magnetic moment in the form of spin. So, there are stable field configurations which don't get sucked into the singularities and give the properties of all the elementary particles, and that's why we aren't sucked into the BB. Somehow, mass is quantized too... and the strong and weak forces, well ahh... I still got to think about that one.