Theists often use the basic metaphysical principle that something only comes from something as evidence for God’s existence. We reason that if the universe (something) came into being, then it must have been caused to come into being by something else – it could not have simply materialized out of nothing without a cause because out of nothing, nothing comes. The something that brought the universe into being must itself be immaterial, spaceless, and eternal, which are some of the basic properties of a theistic being.
I have heard a few atheists object to this argument by questioning the veracity of the basic metaphysical principle that something can only come from something on the grounds that we have never experienced nothing to know whether or not it is possible for something to come from nothing, and thus we cannot know that it’s impossible for something to come from nothing. While we may not have any direct experience of something that comes into being from nothing, it does not mean it’s not possible. Indeed, in the case of the universe it was not only possible, but it actually happened.