I have a friend who, while she was recently ordained as a minister, 
is involved with what is called "the historical Jesus" movement 
amongst some more liberal Christian clergy.  They hold with the 
results of The Jesus Project, i.e., that Christ, if he did exist, was 
not divine, nor the son of God; they revere him as a teacher, a 
mortal one.  They also feel free to reject certain of his teachings.  
She and I have gone around about how those who profess their beliefs 
can honestly call themselves "Christians" anymore, since I thought 
the basic tenet of Christianity was a belief in Christ's godhood and 
that he died for our sins.  She maintains that the heart of Christian 
belief is his teachings, the "Christian virtues".  So she feels 
comfortable still identifying as a Christian...tho she was willing to 
say that the label "post-Christian" might be a viable one...
Post-Christians...that's an interesting concept...