Here’s a good description of liberal Christianity, from James McGrath:
Liberal Christianity, in a nutshell, is simply one form of Christianity that has existed for as long as Christianity has. It recognizes that the Bible is a collection of works by human beings and not written by God, and that there is a need to be open to other sources of information besides Christian or Biblical ones. Liberal Christianity seeks to do honestly and consistently what all Christians do, even if they do not admit it, namely decide what we should believe and do, considering not only Biblical texts or church hierarchies, but also other sources including our own reason. While some Christians claim to be based on nothing but “the Word of God” and to not pick and choose, that claim is never, ever true in reality. And so, while there is a long history of conservatives trying to put liberals on the defensive for “picking and choosing,” liberals should courageously point out that conservatives do so without admitting it, and often without a clear rationale. To be a liberal Christian is to seek honesty, consistency, openness, and breadth. And contrary to what conservative critics sometimes claim, it is not necessary to cease being a Christian in the process.
For the full post, see:
The Heretical Philosopher 