I’m not going to defend the Southern Baptist Convention, lol. But it is worth noting that slavery had existed since civilisations have existed - likely before the first words of The Torah were ever penned. Despite it taking almost two millenia, Christianity was the force that generally stopped it around the time it gained the most influence, as well as the global reach of colonial empires, even if they were just acting to appease the voters back home - although it still exists underground.

It’s quite silly to blame someone for partaking in a practice they didn’t start, but eventually stopped.

If anything, you could probably argue that if Christianity didn’t have the influence that it had, there’ll still be slaves in our society today.