So, for this article, I’m assuming that you have read Sam Harris’ book, Freewill. If you haven’t, it’s very short, more essay than book, and well worth a read because it raises some interesting points that any proponent of freewill needs to address sooner or later. In lieu of this, you could read my previous article which briefly outlines what I took to be his main ideas.
Somewhat surprisingly, I agree with much of what Harris says… if we assume determinism to be true; specifically, what he has to say about fatalism, quantum indeterminacy, compatibilism and moral responsibility. All of the above are often given as reasons for resisting determinism and Harris, quite correctly in my opinion, rejects them in this capacity.