Uhh, yeah. That's kind of a big deal. Kind of connected to the entire theory.
It's really not a big deal, because the Big Bang theory is not a theory of the "origin of the singularity" or whatever it is you're seeking. I'm not really sure why you don't understand that.
You're basically the religious guy struggling to explain where God came from.
I figured out the problem here. You have no idea what science actually is, or what its purpose is. You look at the answers provided by science and the answers provided by religion and you tally them up side by side as if they're competitors, playing the same game. But they are nothing of the sort.
You seem to think subjects beyond the scope of science are proof of its invalidity. It makes sense that you believe this, because it tracks very well with someone who believes in, or would prefer to believe in, religious doctrine, since religious doctrine is designed to be unfalsifiable.
And that's really where the key distinction lies. If it's unfalsifiable, then it is inherently
not science. This is why you reject science; your brain craves the unfalsifiable, because you feel more comfortable believing those kinds of ideas, as opposed to falsifiable theories.
Don't worry though, because you're not exactly alone. Billions of people feel the same way you do. They don't want 50% of the truth, or 80% of the truth. They want 100% of the truth, and they want it to be the infallible truth. A truth that never changes. A truth they can live their lives by. A truth they never have to worry about defending, because it is an unassailable truth. And that's what religion gets you.
Of course, that truth is complete bullshit. But your brain is very comfortable ignoring that part.
Me? I'm perfectly fine not having all the answers, as long as the answers I do have are based on observation and reason. Bullshit from a religious text doesn't interest me at all save for the sociological and historical context.