Hi Seraphim23,
"I’m talking about the origin of existence itself. The beginning of all beginnings, if there is one?"
To me the best way to think of orign of... questions is a matter of running the clock backwards and seeing where that takes you. For example, the origin of earth is throught to be tied to a giant dust cloud that was in orbit of the Sun much like the rings orbit Saturn. The fact that all the planets orbit the Sun in the same direction and on the same plane tends to support that idea.
The origin of the universe likewise is often a question of running the clock backwards. Since the universe is expanding, it stands to reason the universe in the past was a smaller and hotter place. Just how far back can you take this? Alas, not all the way! As you go further back and get the universe into a smaller and smaller and hotter and hotter space the calculations begin to break down. We must then say, we don't know. All we know is that the universe is here.
Calling it "chance" doesn't seem to help in my view. In fact all the words one could use, breakdown and make little sense. You can't talk about "before" the Big Bang, because "before" relates to time and time doesn't exist until after the Big Bang event. You can't talk about "cause and effect" because, again, that is an artifact of our universe. So, the best word we can come up with is "nothing." Although such a word seems odd, as far as I can tell, it has been chosen to reflect that fact that what is being discussed is exactly not anything within the physical universe.
Cheers,
-Randy
ps. In regards to the JW thing, I was just responding to simplistic dismissive use of the word "chance" one finds in Awake! and The Watchtower.