White Christians invented the modern idea of race. They were the ones who practiced race-based slavery, dominated the global slave trade, and took slavery to a massive scale.

But when slavery got too expensive and the Industrial Revolution needed free, efficient labor, they conveniently decided to abolish it, though there were also many White Christians who used the Bible to fight against abolishing slavery.

Also, contrary to what Christian supremacists claim, slavery was not a dominant aspect of all ancient cultures. In some cultures, slavery was considered immoral and was not practiced. Not all ancient societies were slave societies, unlike European societies.