I understand that you are not a Christian based on what you said below about Christ. Slaves in the Bible are different from the slaves we have seen in the last couple of centuries. They were 'bond servants.' This means they worked (like a job many work for today) to pay off an owed debt. Now, have you ever heard of someone working off a debt? Think of it this way: anyone with a credit card or loan, etc. is working off a debt. In other words, we are all slaves to the big banks and corporations and governments above us.
Further, we are all slaves to the law. Even bad laws which the liberty movement seeks to reform. We are ALL slaves to ourselves. One of the things Christ seeks to do is liberate us from ourselves and give us forgiveness.
When you sight single verses from the Bible, or when one does, it's usually in an attempt to take the text, purposefully or not, out of context. I believe that you are looking for reasons not to believe and not really intending to take it our of context, but are reading it for what it says and thinking of it in today's interpretation. That is a wrong way to look at it.
And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruning hooks: nation shall not lift up sword against nation, neither shall they learn war any more.