By Jonathan Merritt:
One of the markers of the neo-Calvinist movement is isolationism. My Reformed friends consume Calvinist blogs and Calvinist books, attend Calvinist conferences, and join Calvinist churches with Calvinist preachers. They rarely learn from or engage with those outside their tradition. (My feeling is that this trend is less prevalent among leaders than the average followers.)
The most sustainable religious movements, however, are those which are willing to ask hard, full-blooded questions while interacting with more than caricatures of other traditions. When neo-Calvinists insulate and isolate, they hyper-focus on those doctrines their tradition emphasizes and relegate other aspects to the status of afterthought. The Christian faith is meant to be lived and not merely intellectually appropriated. This requires mingling with others who follow Jesus, are rooted in Scripture, and are working toward a restored creation.