I believe most Christians have addressed and acknowledged that black men were not treated well by many in the previous generations. And much of what happened was sinful and wrong. But like you said, the Bible does not condemn slavery.
And herein lies the problem with trying to adhere to ancient dogma and its associated deities.
You can not unequivocally say slavery is wrong. Because 'your book' didn't. In fact your book condoned slavery. You can not even bring yourself to write down that slavery is wrong because your book did not. All you can muster up is a tepid, 'I am glad there is no slavery', such is the magnitude of your cuckedness. You have some options, as does organized religion, but I fear you both lack the strength to walk down those roads.
Just admitting the book got it wrong is probably anathema to you. Plus, if you admit that the Bible got this wrong, there is a long line of horse shit behind this just waiting to be looked at. But failure to do this just pushes organized religion further and further out of touch.
I am an atheist so I have no skin in the game, but IMO for organized religion to have a future, some clever fella is just going to have to come in and scrap the whole fucking book. Just jettison all the patriarchal homophobic bullshit as well as the fantasy, and hone it all down to the 10 commandments. Which could really be condensed down to 5.
1) I'm the man (that pretty much encompasses commandments 1-4)
2) Don't lie, cheat, steal or kill. You should put that to the Eddie Guerrero Walk in.
3) Listen to your parents
4) Don't fuck the neighbors missus.
5) Don't be jelly or you have to go to jelly school