Where did the material for the Big Bang come from?

For those of you that agree with the Big Bang Theory, what are your thoughts on where the materials to begin the process came from? How did these atoms, molecules, subatomic particles, pure energy, whatever it might have been, come into existence?

I know some of you are of the opinion that God created the world and there’s no more to it. For those of you with that creationist view, what are your thoughts on where God originated from? Who created him/her?
Can I please ask the collective to respect any viewpoints that people may put forward on this topic