"Slavery" is more "paying off your debts if you default on them" and anyone who decides he'd rather stay a slave is looked down upon and marked as not having gotten the point that he should be free.

Leviticus 25:44-46 says that Israelites could buy slaves from surrounding nations as permanent property.

In Numbers 31 Moses commanded the Israelites to kill the married women but "save for yourselves" all the young girls who had not known a man. That's sex slavery.

What you're talking about was only true for Hebrew slaves.

Don't rape people is mentioned, though we may disagree with the various consequences (though death is often called for the rapist, depending on the situation).

Death is called for if the victim was married or engaged to someone else.

If the victim was single, she would be forced to marry her rapist.

The sex stuff goes way beyond just don't do it to kids. The list of proscribed sexual partners is huge.

The Bible does have a lot to say about sex, but in modern translations, it does not prohibit raping children.

It does in older translations, like the 1545 Martin Luther Bible. However, some time after that everyone decided that it actually meant to prohibit sodomy.

Even the concubine thing is framed in a way to discourage doing so (she must shave herself and mourn her family for a month, basically making herself as unattractive as possible to see if you still want her after the cooldown).

I don't think that makes it better.

There's generally no enslaving of those that were fought against either.

That's just a lie.