It seems to be conveniently forgotten that, even at its cultural height, Christianity was set within secular cultures. It arose within imperial Roman culture (which was famously shifted, not abolished, when Constantine converted). When it arrives in pagan Anglia, or Frisia, it does not simply take over the institutions and alter everything, but inherits trial by ordeal, slavery and whatever else, which have to be “converted” from within - often against the sustained opposition of the traditional power structures.
And, one must add, it is Anglo-Saxons and Frisians who get converted, and need first to have their own prejudices healed by the gospel before they can start on society - have you read the struggles Augustine had against his habitual love for the amphitheatre when he converted? It would have been even more problematic if a gladiator was converted - or the amphitheatre owner.
So is it more significant that slavery persisted in Roman society as long as it did, or that Gregory of Nyssa wrote the first serious anti-slavery argument in history and shifted thinking so that Christians began to see it in moral, rather than economic, terms? Is the presence of rapacious slave traders and owners in America the significant thing, or the fact that Britain and America were the first societies in history to abolish slavery (thank you, Messrs Wilberforce and Lincoln), on the grounds of its immorality, and to impose that abolition on the rest of the world as far as they had power to do so? Go to Libya now - the slave markets are out in the open.
As for Roe v Wade, is Patrick right that the case was a blow for the rights of women against religious bigotry, or is “Jean Roe,” ie Norma McCorvey, right in her claim that her weak position was exploited by progressive activists back then, which explains her own efforts since to get Roe v Wade reversed? Or does her conversion to Christianity make her now part of the oppressive ideology and negate her own individual rights as a woman? “You will support your right to free choice, even if we have to use the law to force you.”