@NBTX11, I think the guy asking you this question is kinda missing the point of the Bible.
The Bible isn't chiefly a book of God's rules and laws. It isn't a book of "
Basic
Instructions
Before
Leaving
Earth".
It is the Book about God Himself, particularly as expressed in His Son, our Lord and Savior Jesus Christ.
Yes,
The average modern person on the street finds polygamy and slavery to be equally reprehensible.
Though it offends modern man, the Bible does not seem to treat either polygamy or slavery/indentured servitude as inherently or fundamentally sinful.
Both can be done sinfully, when men and women fail to properly love God, and therefore also fail to love their neighbors.
The LORD our God is One. Have no god before or beside YAHWEH. Love YAHWEH with all your heart, mind, soul and strength. Love your neighbor as yourself. Do unto others as you would have them do unto you.
These statements pretty much sum up the Law. The man who does these things honors God if he is a slave, a slave owner, a single man, a husband of one wife, or the husband of multiple wives.
Absolute love of God, and devotion to Him is the fundamental issue, and Christ Himself is the only Way to get there
Paul dealt with slavery in the epistle of Philemon (and elsewhere). Paul instructed his new Christian brother Onesimus (who was a runaway slave) to return to his master (and now Christian brother) Philemon. Paul instructed Philemon to no longer regard Onesimus as a slave, but rather as a beloved brother in the Lord. Paul elsewhere commanded slaves to serve Christ in the way they served their earthly masters, knowing that Christ was their true Master.
Paul did not require Philemon to terminate the economic relationship with Onesimus. He went far deeper, and said Onesimus is your brother in Christ.
Christ is all in all! He must have the supremacy. We belong to Him.
Honestly, the man who truly believes that Jesus Christ is the Son of God, the man who understands what God in Christ has done for him, the man who freely gives himself as slave to Christ is free indeed.
He is free if he is a slave.
He is free (and also simultaneously a slave to Christ) if he owns a slave. In both cases, being slave to Christ, he is free.