Right. So inserting a period of time where the normal laws don't apply, because the normal laws can't explain something, is good solid science.
Personally, I'm in wonder at the prospect that there is exactly the right amount of matter in the universe to create a "big bang" and not a bit more. What are the odds of that? Would you not perhaps think it more likely that if a large super-crunch of matter were going to explode, that it would do so at some point before it all came together? Perhaps when 100 billion galaxies came together and not 500 billion? And that would rip through pre-existing matter.
If there was a big bang, I find it highly unlikely that there was only one. In fact, could the expansion not be increasing because there is a lot more matter out there? In effect, the now visible universe is but one kernel in a pot of popping popcorn. The difference being that matter is thrown back and forth.
I'm sorry, but you don't understand the Big Bang theory at all. There was no universe before the Big Bang. There was no matter, there was no space, there was no time. There was absolutely nothing.Sounds a lot like the Bible, doesn't it?