I don't think that anyone agrees that all matter and energy collapsed into a single spot. That is the steady state theory which I think has been shown to have some problems with the math.
It seems that the universe began as a pea sized singularity in which all matter, space and time was fused into one thing. As mind boggling as it may seem, there was no space around this pea sized ball because space and time only came into being as product of the explosion.
It just popped into existence. I guess that this kind of popping occurs on the sub atomic level all of the time.
Theists believe in a Creator who is outside of space and time and created the ball and caused it to explode. The big bang theory seems eerily like Geneses chapter one and the doctrine of Creation ex nilio (out of nothing).
However, as you might expect, there are physicists who try to come up with other explanations to deny what I think is the obvious answer (God did it). For them, the universe just popped into existence for no reason.
You didn’t explain what I asked. Where did the material that exploded come from, and if there was no space what was there? You can’t have an explosion that creates matter, you can only scatter it with the explosion, and sometimes you turn matter into energy when it explodes, such as in a nuclear explosion. I would imagine the “big bang”(which I don’t subscribe to, BTW)would have many orders of magnitude above any nuke explosion we have ever witnessed. Nope, your little rambling comment explains nothing. Nothing I have ever read answers the question: Where did the original matter come from?