You seem to be assuming that my goal is to make a point that would somehow be in favor of Christianity in general. My writing was not motivated by any such goal, and lumping all historical Christians (under whatever definition) together on an issue like this is meaningless, given the diversity of their views. Moreover, it is clear that the concrete people and denominations who stood behind abolitionism were on the outer fringes of Protestantism, and motivated in their activism by their peculiarities much more than any universal Christian beliefs.
My goal was merely to clarify the historical origin of the concrete anti-slavery laws and attitudes that are in force in today's world, not to speculate on what exact circumstances are likely to give birth to anti-slavery ideas.
I wanted to bring attention to two posts from Razib Khan's Discover magazine gene expression blog (some of you may have been readers of the still active original gnxp) on the polemic surrounding Pinker's The Better Angels of Our Nature.
Relative Angels and absolute Demons (and the related But peace does reign! )
I generally agree with some of his arguments, but found this quote especially as summing up some of my own sentiments: