This feels like a false dichotomy to me.
If my identity that I choose for myself is "follower of religion X/sports team Y/band Z", then that's completely compatible with financial success.
If I pick "I'm a beach bum", and seriously try to live that out, well, that doesn't pay very well. If I pick "I'm a professional skier", that may pay well, but the odds are it won't, and seriously trying to pursue it is probably going to preclude most well-paying jobs.
So "largely at war with each other" was probably an overstatement. And as I said, they aren't diametrically opposed - they aren't totally at odds with each other. Still, they seem to me to be at least somewhat opposed to each other - if nothing else, both can take our time, attention, and effort, and we are finite. What we give to one, we don't have available for the other.