Generally speaking there's a certain mindset that his form of self-help applies to, if you don't have that mindset the book probably won't act as good self-help, if you do he's apparently a Godsend (pun intended :) ). I came into the book having listened to a bunch of Peterson's podcast/debates and was aware of the political situation that surrounds him before picking this up, so that may have steered my listening of the book.
Instead, it provides me an opportunity to pause and reflect, and I often become more understanding and empathetic by incarnationally listening to others who perceive the world differently. And in those 40+ years I've learned that just because somebody has a different perspective than me, doesn't necessarily make them wrong. But Peterson shared thoughts on some passages that I've never, ever, ever heard in my life (of over 40 years). To be fair, I would consider myself a student of the Bible, so perhaps my opinion is moot here on reddit.
Heck, I have staunch atheist friends who readily acknowledge the value found within some passages of the Bible. Dismissing something completely just because it quotes the Bible seems an odd decision. Peterson brings a different perspective, which at the very least ought to cause the reader to pause and reflect. Maybe it's just me, but I would guess that the majority of folks who hear Peterson quoting the Bible and immediately find it off-putting - just because it's the Bible - likely haven't spent much time grasping how some of these same passages are taught by evangelical christians today. What's interesting to me, is that the religious understanding he shared is quite different than what you'd hear in much of the Christian/Evangelical world (in the West) today.