In my definition, fatalism is a locked-in meta narrative, or the big picture. Both religious people and atheist share that view. Determinism, on the other hand, is absolute control on a granular level, which is held by most religious people but only a few atheists. The religious person believes that the personal creator is deterministic (controlling all trivial events of our lives) because it proves him/her to be big. But I propose that it does the opposite. When we say that God must be in control of all events, then it is us defining God and putting him/her in a tin box. The more important reason that we believe in theistic-determinism, is that we are narcissistic, believing that God designs the entire cosmos around us. That even a flea can't jump on us unless God intended for it to. I believe a much healthier view is that God is so big that he/she does not fit in the clothes that we've tailored for him/her. That God does chose to let chance take its course. This is mostly true in Christianity, which has this cosmos as broken as one of its major tenets. In a broken cosmos, shit happens.