God never says slavery is ok. It exists, as sin exists, as a fact of life. To equate an evil in society with creation by a holy God is ludicrous.
God never says slavery is ok.
Once again...
Exodus 21:20-21: "If a man beats his male or female slave with a rod and the slave dies as a direct result, he must be punished, but he is not to be punished if the slave gets up after a day or two, since the slave is his property"
Since this is the literal word of God and God says 'the slave is his property' it's follows that God thinks slavery is OK. There is no condemnation of slavery here.