Those are quotes from Walter Wink. For more detail, you'd need to read his books.
Another more recent book that I found useful on the nature of Satan was Reviving Old Scratch by Richard Beck
I wonder what Girard would have made of the idea that People Don’t Buy Products, They Buy Better Versions of Themselves. This is fairly mainstream thinking in advertising, if you look at a lot of adverts, they are pictures of people who are now happy/relaxed because they have bought whatever product is advertised. It seems there is a link with mimetic desire /u/mcarans ?
I'm currently reading Mark (and blogging about it, albeit slowly), and my go-to is Robert Stein's commentary on that. I also have Xabier Pikaza's commentary on Mark (written in Spanish), which gives another viewpoint.