They use coercion. You initially resist, but when that fails you go through the motions. The invading culture suspects heresy and metes out punishment. Figuring the best way to ensure conversion takes root is via the young, they take your kids and send them away to better control their minds and strip the ancient heathen belief system from them. Success is measured by the elimination of the old culture’s beliefs, and the acceptance of the new culture’s ... and body count of those stiff necked traditionalists who resisted. No title of “martyr” for them; just “dead heathen.”
And so it was in the 16TH, 17TH, 18TH, 19TH centuries and into the 20th in North and South America. And so it was in Africa, and the Pacific Basin. And so it was in Australia and New Zealand. For this is the “mission” of Christianity. Destroy indigenous cultures, steal their children’s birthright, rape their minds, and instill the fear of hell and damnation the better to cultivate a love for their mythical “prince of peace” man-god. Save their souls even if it kills them.
No other religion on the planet, save Islam, proselytized by the sword and gun. No other belief system of an invading culture more worked toward the eradication of the conquered culture’s indigenous superstitions. Not the Romans, the Saxons, the Persians, the Greek city states, the Visigoths, the Hun, the Mongols, none of the “barbarian” tribes and cultures. Only Islam rivaled it.
Fact is, considering Christianity's methods and impact, calling those tribes barbarian is a misnomer. For while those tribes conquered and pillaged and laid claim to the spoils, pre and non-Christian conquerors left the vanquished people their birthright - their cultural beliefs and practices. And if those beliefs gradually declined as a result of assimilation, it was not by threat of death or institutionalized brainwashing.
This is the legacy of Christianity. But it doesn’t stop there. It goes on, just more subtly.
As I type this there are hundreds if not thousands of “Christian Group Homes” for troubled children in the US and around the world who are spreading the faith and saving souls through Christian barbarism. Operating under the guise of helping the most vulnerable among us to education, social adjustment and assimilation they rape both their minds and their bodies.
Not until one of these religionist snake pits are exposed due to some outrageous excesses becoming public is there an investigation and intervention by secular authorities who always feign surprise that such a thing could happen. Why? Because Christianity gets a pass. In Western culture if it's Christian sponsored it must be good, the barbaric history of Christian outreach to those who never asked for it not withstanding.
Whether for financial gain or out of this sick need to infest minds and save non-existent souls, the barbarism of Christianity missions will never end until its false attributes of goodness and godliness are stripped away and it’s thrown into the trash bin where the atrocities of history belong.