Thanks for that review. I was just planning on buying that book, too. I did take Dr Lamoureux’s free online course, which I think mirrors that (on Coursera).
I, too, have struggled about that question. I read a lot of George Macdonald as a teen (influenced C S Lewis and was somewhat of a reactionist against his strict Calvinist upbringing). So, I admit I’m more eager to accept Lamoureux’ point of view. I can go into that more. However, you might find Michael Heiser’s (head of Logos software) discussion interesting: Dr. Michael Heiser on Original Sin - YouTube. He is quite orthodox, but believes a different interpretation is appropriate for original sin.
Peter Enns (Inspiration and Incarnation, Evolution of Adam); Brian Zahnd (Sinners in the Hands of a Loving God); and Brad Jersak (A More Christlike God) are on that side, too; but others can comment very well, and in very valid ways, on the other side from this forum.