That's why Christians don't sell and own slaves anymore. That's why Christians don't stone homosexuals to death anymore, etc. The Bible condones those things, however.
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First of all, when you view Biblical slavery through the lens of our experience here in North America from the 17-19th century, you're comparing two different things.
Typically, there were three types of slavery: cultural slavery, which the Bible does not condone, but simply acknowledges did exist, slavery as a means of God's judgement on a people, and the most common kind of Biblical slavery, which was much closer to what we know as indenture.
If you're going to try to paint the Bible in a bad light by saying that it condones slavery, then you need to be honest and also acknowledge that the Bible lays out very strict groundrules for those who own slaves, including harsh penalties for those who mistreat slaves, as well as an order to release slaves and cancel debts after a given period of time.
Second, how can you say that Christians don't stone homosexuals anymore, when the Bible never says that Christians stoned homosexuals?
That's a bit like asking, "so, do you still beat your wife?"