The Bible mentions slavery. It doesn't endorse slavery. I guess in YOUR lexicon, being aware that something exists is tantamount to approving of it.
But I guess that would make sense to anyone simpleminded enough to think "created equal" means "born into and existing in exactly the same circumstances".
As for "all men are created equal" arising from the Bible and Christianity, the Bible tells us many times that we are all the children of God, and that God loves us all. Christians are smart enough to extrapolate from that that we are each of equal importance and value in the eyes of God, aka "created equal". I'm very sorry that you couldn't get that on your own.
The problem with those that believe in mysticism usually know very little about it. How many know that Judaism, Islam and Christianity were all founded by the same guy. He didn't found three religions, but only one.
Christians who are slaves should give their masters full respect so that the name of God and his teaching will not be shamed. If your master is a Christian, that is no excuse for being disrespectful. You should work all the harder because you are helping another believer by your efforts. Teach these truths, Timothy, and encourage everyone to obey them. (1 Timothy 6:1-2 NLT)
That doesn't sound like an endorsement? WTF? Sounds like one to me.
Slaves, obey your earthly masters with deep respect and fear. Serve them sincerely as you would serve Christ. (Ephesians 6:5 NLT)
And those from the New Testament. And don't give us that crap that slave didn't mean slave. It was slave all right.
Old Testament:
However, you may purchase male or female slaves from among the foreigners who live among you. You may also purchase the children of such resident foreigners, including those who have been born in your land. You may treat them as your property, passing them on to your children as a permanent inheritance. You may treat your slaves like this, but the people of Israel, your relatives, must never be treated this way. (Leviticus 25:44-46 NLT)
This isn't about slavery, or is it?
(Deuteronomy 22:28-29 NLT) If a man is caught in the act of raping a young woman who is not engaged, he must pay fifty pieces of silver to her father. Then he must marry the young woman because he violated her, and he will never be allowed to divorce her.
Aren't you the one that didn't know anything about science?