I don't know the answer to such controversial question but let me ramble on about a related topic. I once listened to a talk in which one of the speakers who firmly believed in determinism said that every one of our actions/decisions is a result of interactions between atomic/subatomic particles. At first it sorta made sense to me. Then another speaker who believed in free will questioned his claims by saying that "particle" is a very vague concept. We don't exactly know how to define it. We can't base an entire theory on something that is not well-defined. And then again this made sense to me too! Take for example electron; It both can be considered as a particle and a wave. You know better than me about these issues. I'm just surface thinking ... I feel that supporting determinism needs tools more than just mere philosophy; You need to know about physics too.