It is true that those who transported slaves from Africa to South America, the Caribbean islands, and North America came from nations that professed Christianity. How many professed more than that, well, Gallup wasn't around back then, so no one really knows. Of course, such facts matter not at all to DU's and other Christian-Haters.
Similarly, the South American colonies/countries, Caribbean islands, and North America colonies/countries in which slave owners lived professed Christianity. The percentage of slave owners who actually professed Christianity is probably also unknown, but certainly many did. Some who professed Christianity also twisted it to support slavery; others disliked slavery, but did not see a way forward to free their slaves with those freed slaves able to function fully in society and without themselves being bankrupted.
That's a bigger, more complex, picture than LPC Noob Nuggets would acknowledge. But there are parties to the slavery process that the aptly self-named Nuggets would be loath to acknowledge, the slavers who sold African blacks into slavery. A large percentage (majority?) of these were either animist rival African tribes or Muslim African tribes and Muslim Arabs. IOW, if slaves reflected on the religions of those who enslaved them, none were particularly humane.
IOW: animists enslaved and reveled in their plunder; Islam justified taking and keeping slaves; "Christians" ranged from nominals who professed and lived nothing to those who understood that New Testament instructions that (then) new converts treat their slaves as potential or actual brothers and sisters and that slaves work diligently while exploring and using ways to gain their freedom as basically anti-slavery. How many slaves had the time and energy and range of experience to think that deeply is an unknown, of course. In the US, at least, there were many churches and faithful Christians who offered kindnesses and love, and slaves wanted that and wanted to be part of that.
I think, though, that self-named LPC Noob Nuggets doesn't really want to delve into the complexity of ~400 years of the history of blacks and Christians in what is now the US. (S)He just hates Christians and is frustrated that blacks don't perceive Christians as (s)he does.