It is ridiculous to say that ‘Paul supported slavery’ because he accepted the existing political reality of it under pagan Roman rule. He was certainly not in favour of it, and encouraged slaves to get their freedom if they could (1 Corinthians 7:21, although the translation and meaning is somewhat disputed according to an interesting bible study on slavery here http://www.bible-researcher.com/slavery.html). Preaching the free gift of eternal life through faith in the risen Christ was Paul's God-given job, not starting a doomed political movement against Roman rule. Twenty first century liberals might as well take him to task for not suggesting some improvements to agriculture and sewage, or inventing vaccination. Surely, taken with the words of Jesus ‘Render unto Caesar the things that are Caesar’s and to God the things that are God’s’ this is not a particularly difficult point to comprehend? In the long run, rich man or slave, we are all dead-and will account to God for the life that we have lived.
If Britain profited from the African slave trade in past years before Evangelical Christians like Wilberforce saw it ended, today we also profit from goods and food produced by effectively outsourced slavery. This is a sin which grievously offends God according to the New Testament (James chapter 5:1-6).
He wrote that shortly before the death of the atheist slave owner Korean ruler Kim Jong Il and was probably thinking about him and his victims.