Here are my articles and episodes dealing with the question of "slavery" in the Bible and why the objection against the Bible is often misleading, misinformed, ignorant and just flat out wrong.
1. Slavery in the Bible Part 1 - History and Culture (audio)
2. Slavery in the Bible Part 2 - Casuistic Laws in the Old Testament (audio)
3. Slavery in the Bible Part 3 - Slavery in the NT and History (audio)
4. Exodus 21:20-21: A Manual for Beating Slaves?
5. Shall Not the Judge of All the Earth Do What is Just? (audio). [This really should go first, but I put it at the end since many will come here simply for the episodes directly on slavery.]