Roger lists paradigmatic theological liberals as Schleiermacher and Marcus Borg, I’d add Harvey Cox as another example.
One observation: over the years I’ve seen lots of evangelicals “drift” into liberalism. Quite often they refuse to admit they are liberals. What happens is that they absorb evangelicalism’s denunciation of liberals as non-Christians while simultaneously both embracing liberalism and thinking (and knowing) they have not left the Christian faith. Evangelicals have successfully made “liberal” a pejorative term. So today many liberals call themselves “progressives.” Is there any difference? What are the “marks” of a liberal?
What do I look for in trying to discern whether a person or group is really theologically liberal?
First, I look at their overall view of reality. Do they think the universe is open to God’s special activity in what might be called, however infelicitously, “miracles?” Do they believe in supernatural acts of God including especially the bodily resurrection of Jesus including the empty tomb? If not, I tend to think they are liberal theologically.
Second, I look at their approach to “doing theology.” How do they approach knowing God? Do they begin with and recognize the authority of special revelation? Or do they begin with and give norming authority to human experience, culture, science, philosophy, “the best of contemporary thought?” That is, do they “do” theology “from above” or “from below?” Insofar as they do theology “from below” I tend to think they are liberal theologically.
Third, I look at their Christology. Do they think Jesus was different from other “great souls” among us in kind or only in degree? Is their Christology truly incarnational, affirming the preexistence of the Word who become human as Jesus Christ, or is it functional only, affirming only that Jesus Christ represented God, was God’s “deputy and advocate” among men and women? Insofar as their Chistology is functional and not ontologically incarnational, trinitarian, I tend to think they are theologically liberal.Fourth, I look at their view of Scripture. Do they believe the Bible is “inspired insofar as it is inspiring,” a wisdom-filled source of religious illumination and record of our “spiritual ancestors’” experiences of God? Or do they believe the Bible is supernaturally inspired such that in some sense God is its author—not necessarily meaning God dictated it or even verbally inspired it? Another way of putting that “test” is similar to the Christological one above: Is the Bible different only in degree from other great books of spiritual wisdom or in kind from them? Insofar as they view the Bible as different only in degree, I tend to think they are liberal theologically.
Fifth, I look at their view of salvation. Do they believe salvation is forgiveness and reconciliation with God as well as being made whole and holy by God’s grace alone or do they believe salvation is only a realization of human potential—individual or social—by spiritual enlightenment and moral endeavor? Insofar as they think the latter, I tend to think they are theologically liberal.
Sixth, I look at their view of the future. Do they believe in a real return of Jesus Christ, however conceived, to bring about a new world of righteousness? Or do they believe the “return of Christ” is a myth that expresses an existential experience and/or social transformation only? Insofar as they believe it is only a symbol, myth or metaphor, I tend to think they are liberal theologically.
The problem is that discerning whether someone is theologically liberal is not a black-and-white process. It’s not an “either-or.” Many people and groups are some kind of mixture, hybrid of conservative and liberal. But, in my book, anyway, a true liberal is one who for the most part leans toward the views I have labeled “liberal” above.
So what’s wrong with being liberal theologically in that way? I find it thin, ephemeral, light, profoundly unsatisfying. It seems to me barely different from being secular humanist. Sure, theological liberals (in the sense I have defined that type above) can be profoundly “spiritual,” but I don’t think they are profoundly Christian. Their commitment is greater to modern culture, the Zeitgeist of the Enlightenment, than to Christian sources. Their “Christianity” is barely recognizable if recognizable at all—compared with anything that was called “Christian” before the Enlightenment. Ultimately, I believe, theological liberalism robs Christianity of its distinctiveness, the “scandal of particularity,” its prophetic edge and makes it easy, respectable and dull.