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That's a very nice story that even a casual awareness of the history of the Christian West makes totally implausible. The Christian West was not immune to scapegoating in much the same way that the sea is not above the sky.Didn't have to be immune (humans are humans after all, nothing is 100% perfect), just more immune than what preceeded it.
The main idea Christianity added to the table was that the victims are not just unfortunate, or losers, or collatera damage to the natural order of things, but possibly even more justified than those who lord over them.
There were still masters and slaves, injustice, etc despite Christianism, and even in its name, but not because of it.
Similar to like there was injustice and slavery after the Constitution or injustice and racism in the US today, but it's not because of the Constitution itself - which was an improvement and placed a seed for betterment --, but because people are people).
The seed that got into the culture with Christianism was that this is not just "the way things are". Suddenly the victims had a claim to moral superiority and injustice. In the ancient/pagan world they would be laughed off. In the Christian world they might be driven off with sticks still, by those in power, by they couldn't totally eradicate their claim to injustice [that's also why Christianity caught on with oppressed populations, even with those that shared the religion with their opressors, like black slaves in the US or indians in Latin America: it offered a way for the slaves to claim moral superiority and dignity. Incidentally that's how it got its major boost in ancient Roman empire as well].
That's one of the themes of Nietzsche by the way, which he sees as a negative of Christianity (kind of like some lament the modern "victimhood culture") - he preferred the good old times, when masters where masters, and victims would just suck it up and admit defeat and accept that they are lesser men.
(As for the hunt for the "witches/satanists" it's an overplayed minor characteristic of Christianity. Plus, the reason we see those victims too in a favorable light, it's still because of Christian influence. The culture/religion of the group that persecuted them is exactly what promoted them to innocent victims to be pitied/vindicated. The ancient world only cared for effectiveness, victims were merely losers to be tossed aside.