Well, the entire first half of the Bible is before the birth of Christ, and when Christ arrived the religion began whats called the New Covenant with God, replacing the old covenant which bound followers to the old laws of the old testament.

something being "in the bible" is meaningless without its context. Theres quite a breadth on the capturing, keeping and treatment of slaves - would you argue that these verses are the same as Christs teachings?

>As for the male and female slaves whom you may have, it is from the nations around you that you may acquire male and female slaves.

> You may also acquire them from among the aliens residing with you, and from their families that are with you, who have been born in your land; and they may be your property.

>You may keep them as a possession for your children after you, for them to inherit as property.

But hey, if you think being a Christian means following any phrase you happen to pick out of the Bible, go for it.