All things within the universe. Comprises of matter and energy (forces resultant of the interaction of matter).
Can be described at a single point with the term, something
Everything can only exist if there is nothing, which in turn can only exist if there is something, because nothing is the absence of something
Theist: god created everything in the observable Universe from nothing because he is almighty
Atheist: There was no creation because nothing cannot exist if there wasn't something to be absent of, therefore there was no creation, time and existence are infinite, and the notion of god is irrelevant let alone substantial
Theist: *Head explodes*
Some Guy: Dude, you just disproved the existence of god with a dictionary