Vidqun: "Secondly, if Christianity opposed the slave trade during the Roman period, they would have been wiped out."
Christianity did not have to confront Rome to abolish slavery within its ranks. All Christians had to do was to require all potential converts who held slaves to liberate them as a precondition to becoming a Christian.
"We live in a different epoch. Firstly, Jesus was not a social reformer, but a religious reformer..."
Jesus' attitude concerning slavery can be seen in many of his parables where he often uses the metaphor of slavery in an approving manner.