The core of his work seems to center around the growth and segregation of religious diversity among populations and their ultimate reconvergence. I haven't read too much of it but the idea seems to be that societies used to be heavily divided in the US based on religious lines, but over time those religious segregations died down and a more diverse and stronger idea set was left.

His racial argument is on the social construct of race instead of the biological construct, where socially held beliefs which are attributed to certain races can be overcome through close proximity. While it initially causes a hunker down effect in those who still hold tight to their cultural beliefs, the few who don't hunker down can deconstruct and reconstruct those beliefs into new ideas.

I don't understand what makes this particular approach wrong though. Without analogy he's looking at the core of the problems he sees so that he can find a solution. The biggest problem seems to be the effects of time on this social value issue. His paper only accounts for a single point in time, with no accounting for how things change over time. His other studies lead him to believe that the situation will change over time out of necessity.