It doesn't matter if god exists, it matters that most everybody thinks one exists. Using that belief to discuss piracy is not a flawed discussion, and it is not dependent on the actual existence of a god, just the existence of people's belief in them.

And here's where we disagree. I suppose I can see this logic, but my issue is that anyone can and will interpret "God's will" in their own way. How the author presents their case is less reasonable than simply talking about the moral justifications from a secular standpoint. People who rely on God's opinion that much are likely some variety of fundamentalist and not likely to be engaging in piracy in the first place.

So for the rest, why bother with the religious part, since they'll just interpret in their own way?