Just to state that something exists as a brute fact does not remove the problem of something needing a cause or an explanation for its existence. Consider this. Theists often get flack from atheists who accuse theists of saying that God is a brute fact. Thus, they come up with all kinds of nonsensical things like the spaghetti monster as an alternative explanation to God. Since one brute fact is as good as another. Why not posit 10000 spaghetti monsters? Why just one? Or all sorts of things we could imagine as brute facts that cause the universe. Since a brute fact has no explanation. We just have to accept it. However, for the classical theist God is not a brute fact. He is the necessarily existing being. Since we derive a necessarily existing being not from a brute fact but from reasoning about existence. God in this sense is only a slice of the being from the gods of religion, but it is enough to disprove atheism.
Actually, to conclude that universe requires a cause is not the fallacy of composition. It is actually a sound induction. The fallacy of composition is to conclude that because part of a thing has a property then the whole thing itself must have that property. Now, sometimes the whole thing does have the same property as its parts. For example a white picket fence as a whole is also white, not just each individual board. However, other times it does not. For instance, if part of an elephant is light it does not mean the whole elephant must also be light.
Now, if I was arguing solely that because every part of the universe has a cause then the whole universe has a cause that would be fallacious. However, the reasons that I can give for the universe requiring a cause are:
- The universe is not a necessarily existing being. The universe could not exist or it could exist differently implies it does not exist necessarily.
- Something can not come from nothing. Or, a thing can not bring itself into existence from nothing.
- If things can come from nothing why don’t we see this happening all the time? Why not Einstein or rabbits coming from nothing? Why would nothing favor only universes since nothing by definition has no properties? Nobody seriously expects things like a horse to just pop into existence from nothing. So why would we expect universes to do so?
- If the universe has a beginning as science suggests this only reinforces 1. And, by 2 implies the universe has a cause.
- I can also add that the universe has a beginning for philosophical reasons other than science like the impossibility of having a past infinite sequence of events. Which I have not yet mentioned.
- Science and our experience time and time again confirms number 2. Therefore it is an induction and not the fallacy of composition. Induction draws a conclusion about a class of things based on a sample of them. Inductive reasoning is a basis for all of science and therefore should not be confused with the composition fallacy.