Wow, understand much? The written laws of physics and chemistry is our way to explain what is actually going on. Why does someone have to create it, once you get over the stumbling block that everything has to be designed and created you'll get it.
Everything does have an origin. That's what science is there for...to study how things work and how they came about
The Big Bang theory states that everything in our Universe came from a singularity. The fact that there was 1 less antimatter than matter caused the Universe to exist or nothing would exist, then how thanks to supernovae whose dust 'completed' our planet. I can go on...everything has a cause...everything that occurs and has occurred is never lost and its 'blueprint' exists (scientists, namely Hawkings, once thought blackholes destroyed information but that was proven to be wrong).
The only thing scientists have no clue whatsoever about is what caused the singularity, how it came about, and what existed before it.