I'm here because my parents did something that I'd rather not think about because that's icky. Nine months later I popped out.
If I had to give a Christian response to the question "Why is there something rather than nothing?" I think, at least since the Scholastics, is the a priori philosophical proposition that being is better than not being. That tends to flow out from Anselm's Ontological Argument, that an actual thing is by definition better than an imaginary thing (and that is a fundamental component to his argument for God's existence). Thus the universe--and we--are here because existence is better than non existence. I'm not exactly arguing to the absolute affirmative on this so much as offering some of the philosophical musings of the Scholastic period.
While the Westminster Confession isn't one I subscribe to, its response to the chief end of man is interesting: "To glorify God and enjoy Him forever." I'm particularly drawn to the phrasing "enjoy Him", that man isn't simply a tool, but a relational subject, and that at the heart of the human-divine relationship, what it's meant to be, is one of enjoyment. To take joy in God.
I don't know that I have an answer quite yet, but these are two ideas that I enjoy mulling over while considering the question. I would also throw in the idea of Theosis, and also the idea that God as Creator isn't about God doing something alien, but that the Creative Act is intrinsic to God's Self. Existence is meant to be because the One who brings it about is the One That Exists. An organic outflow of the innate reality of God Himself as the One who generates (as Father), is generated (as Son), etc. That's also an idea I'd want to mull over a bit.
-CryptoLutheran
