McLaren and his colleagues are convinced that the future of the Church and missions does not rest on the kind of faith articulated be modern churches and missions, including conservative ones. Rather, it rests on resisting "modernism" and accommodating postmodernism by recovering "the faith articulated by the common consensus of the ancient Church" as they conceive it. But if partially right on some counts, both he and they are profoundly wrong on others. In the late nineteenth and early twentieth centuries, both liberals/modernists and conservatives/fundamentalists (and then evangelicals) attempted what can be thought of as "contextualizations" of the Christian gospel for modern (Western) culture. The former did it by accommodating traditional faith to modern culture. The latter did it by maintaining and restating biblical faith for modern culture.
McLaren and his colleagues are essentially right in concluding that both contextualizations were culturally-conditioned because all contextualizations are culturally-conditioned by definition. They are also partially right in concluding that the gospel preached in Eastern and other cultures was often quite "Western" and under-contextualized.
But they are profoundly wrong in following the lead of twentieth century liberals when they insist on accommodating postmodernism by resisting biblical authority and replacing the biblical gospel with another gospel of whatever derivation. The postmodernism of McLaren and the Emergent Church movement represents a radical over-contextualization and is destined to fail both the Church and missions in the twenty-first century just as surely as the modernism of Higher Criticism and the Social Gospel failed the Church and missions in the twentieth century. In the end, the biblical gospel--and only the biblical gospel--will prevail.