Then you left Christianity for the wrong reasons. Please come back to faith.
The foundation of slavery as a moral practice rests on the concept of the fundamental inequality of human beings, and that it is both right and good to treat some people as less than human. From the outset, I can say with confidence that the Bible teaches no such thing. The Bible teaches that all humans are made in the image of God and endowed with the dignity that status confers. It teaches that all humans are endowed with this inalienable sanctity of incalculable worth and dignity. As such, owning another human being and treating them like property is contrary to the value God has made inherent in every individual of the human race.
Dr. Craig Blomberg rightly assures us that "the most important matter is [in what the Bible] actually says, and there is not a single text anywhere in the Bible that commands slavery."
Words change in their meaning through the eras. Slavery in the ancient world didn't mean what slavery means to us. With this accusation we need to distinguish between what we as moderns mean by "slavery" and what the ancients meant by slavery. Dr. Paul Wright, the president of Jerusalem University College, says, "When we think of slavery, the first thing that comes to mind is either slavery in the pre-Civil War U.S. or slavery as we hear it in places of the modern Middle East (via ISIS or such groups).
"The textual evidence that we have for slavery in the ancient world (—by this I mean the ancient Near East, the context in which ancient Israel arose, not ancient Rome) shows by and large a different kind of 'institution' (that's not the right word to use). For this reason, the Hebrew word, eved, is better translated 'servant.' The overall textual evidence from the ancient Near East shows that slaves had certain rights—they could own property, for instance, or determine inheritance. Or they could become free, as the Bible allows, given certain circumstances. They were typically not bought and sold, opposite as the case in the medieval and modern worlds. 'Forced Labor,' or the corvée, is a more complicated issue, essentially a tax on person by the government for a certain period of time (e.g., 1 Kings 9:15). Note that the servants that Israel is allowed to take from among the foreigners are able to receive inheritance from their 'owner' (Lev. 25:46).
"The larger question is to what extent the Bible participates in the world of the ancient Near East, and to what extent it expresses a set of ethical standards which at the same time presuppose it yet works to change it. There’s a whole lot of middle ground, actually. This is what makes an understanding of the context of that day so vitally important as a place to start.”
Dr. Wright continues that "there is no evidence of chattel slavery in the ancient Near East. While slavery was known in many cultures there, the type of slavery was debt-slavery, punishment for crime, enslavement of prisoners of war, child abandonment, and the birth of slave children to slaves."
Even about Leviticus 25.46 ("You can will them to your children as inherited property and can make them slaves for life") Jacob Milgrom says: "The law merely indicates that the jubilee doesn't apply to non-Israelite slaves. 'It does not imply that the slave is a piece of property at the mercy of his master' (Mendelsohn 1962:388)."
"Another indication that slaves were not simply viewed as property to be treated however the master wished can be seen in the fact that slaves sometimes shared rights of inheritance (Genesis 15.2-3), where Abraham’s servant will inherit his property if Abraham dies childless, and Genesis 30.1-13, where the sons of Leah's slaves become equal heirs with the sons of Leah and Rachel in the family of Jacob.”
"Slavery and indentured servitude in Scripture involved ownership of a person's labor, not ownership of the person. Any approach to slavery that implies one person can legitimately own another is contrary to Scripture because it denies the humanity of the slave."
And lastly, there is absolutely no extrabiblical data on any slaves in Israel. The private and public documents of the ancient Near East from 3000 BC to the times of the New Testament are full of references to the practice of slavery in the parallel cultures, but nothing from Israel. Cole agrees and says that "slavery in Israel was rural, domestic, and small scale. There were no 'slave pens' of imperial Rome, or the racial subjugation of colonial America." What seems likely is that slavery hardly existed in ancient Israel.
So let me try to pull this together for you.
* There was no such thing as chattel slavery in the ancient world. That didn't happen until the Greco-Roman era, and then just as tragically in the colonial West. That is not what the Bible means by "slavery."
* Most "slaves" of the ancient world were debt slaves or corvee laborers. Debt slaves were more like what we call employees now (working every day to pay off our debts); corvee slaves were employees of the government, much like FDR's CCC.
* The laws in Exodus and Leviticus about slaves are casuistic law (case law). They speak of hypothetical situations to guide judges; we cannot assume anything about them is an actual historical reality.
* There is no extrabiblical data on slaves in Israel. From all our records, it seems altogether likely that slavery hardly existed in ancient Israel, and certainly not chattel slavery.