In another thread I just laid out what our "sin" of birth actually is -- the absence of God. I use "darkness" as a metaphor (as does the Bible) to describe the issue. There is no such thing as "darkness." What it is, is the absence of light. Light is actually "something" -- photons, God, light. Darkness is the absence of that -- "nothing." So, in essence, God did not "create" darkness, for darkness is what is when there is no God (no light -- Read John 1-3).
Our birth sin is akin to darkness. It is the absence of God. It is not some-thing in that it is created. God is not the "author" of sin because sin is the absence of God. God, however, is the author of light and the author of salvation because both are found in His presence.
So, our initial state is that of being absent of God and the sins (note the "s") are the actions (verbs) that those with an absence of God do for any number of reasons, on purpose, by accident, by ommission, by commission, but they are dependent on God being absent, for in God there is no sin(s).
Hope that helps you to understand.
So calvinists view us born into seperation/estrangement away from God due to the fall of Adam, and us found in him and now spiritually dead in ourselves, while Non cals see it as being?