The best way to look at determinism is to see it as the view that everything is inevitable. This can be looked at from a religious perspective, and a non-religious perspective. From a religious perspective, this is the doctrine of predestination. Before the foundation of the world, God decrees everything that is going to happen, from the Fall of Lucifer, to the Fall of Adam, to the death of Christ, to the fall of the Roman Empire, the Inquisition, the Holocaust, the Columbine murders, the 9/11 attacks, and the election of first Bush and then Obama. All of this was predestined by God.
If this were true, would you say that everything was God's fault, or could wrong actions also be blamed on the humans who performed them? If compatibilism is true, then it can be our fault, even if determinism is true. If incompatibilism is true, then we would have to have something called contra-causal freedom (we could have done otherwise from what we did under the exact circumstances) in order to be truly responsible for our actions.
If we take non-religious determinism, then there's no God to cause everything, but we are simply collocations of atoms doing what the laws governing those atoms guarantee we will do. What this would mean would be that if we knew the position of all the particles in the universe on January 1, AD 1500 at midnight, you could know that Hitler would massacre the Jews, that Obama and Biden would run against McCain and Palin and win in 2008, and that the Cardinals would get to the Super Bowl and lost narrowly to the Steelers. Again, we can ask if anything would really be anyone's fault if that were true, since we would be pawns, not of God, but of nature.