Scientists use other writers to parse their theories in language that we novices can understand, thus "those words".
Those words are wrong, they're incorrect.
Nothing "came into existence". Most scientists agree on conservation of energy. There is a fixed amount of energy in the universe, it doesn't change.
What happens instead, is the volume expands, therefore things cool down.
In the beginning as far back as we can trace, all the energy was in a teeny-tiny volume, which then expanded with explosive force (hence the big "bang").
Things were very hot back then, because of the small volume - before there was solid matter everything was in a molten plasma state, kind of like you find in the sun, where there are no "atoms" per se, instead there's just a sea of molten nuclei.
Matter happens as things cool down. Bits of plasma stick together because of the nuclear forces (that's chromodynamics), and they become matter. They become different kinds of matter depending on the exact cooling conditions and volumes and etc. Gases can condense as they cool, contributing further matter.
For life, the first and most essential requirement.is isolation from the environment. Here on earth that's accomplished with "membranes" which are basically layers of oil that separate compartments of water. Science currently.proposes that active membranes developed from micelles. The difference between our membranes and others is that ours use "phospho" lipids instead of regular oils. That means one end of the molecule is charged, and therefore there is a charge cloud around every living cell. Advanced organisms use these cellular charges for muscles and brains. The point being, the building blocks for a complex human brain are very simple. It's just that there are 100 billion of them, which is maybe 10 orders of magnitude give or take.
