I'm not going to pretend I know the origins of the universe. But I don't go around claiming theory is fact. Doing that, is religion.
The big bang is incredibly likely to have happened. They knew
what to look for before they
knew it existed, they started looking, and found exactly what they hypothesized would be there. Now, decades later new evidence is still coming in that supports the big bang theory. It would be incredibly unlikely that after all the calculations scientists have done, all the observations they've made, all the predictions that have been successful, that the big bang theory 'is a bust', as you put it.
Why do you disagree with the findings of virtually every astrophysicist in existence? What merit do you posses that would make anyone consider you knowledgeable about astrophysics?
And you're absolutely right; saying everything was once at a focal point is not the same as saying everything came from 'nothing'. For there to be 'nothing' and then 'something' implies a magical force. Science says "there was something, we have no idea what, but it was in one area, and was very hot, and it exploded into what we call the universe."
If you want speculation, look to the big crunch theory, or multiverse theory, or string theory....
Big Big has real evidence, real observations, tangible data, and a tested hypothesis. Is it possible new evidence could overturn these findings? It's possible, but given the sheer amount of data and the predictive power of the theory, it's unlikely new evidence will overturn, but rather strengthen the big bang argument, providing new details and information into what happened.