A lot of people don't want to hear this but there were European tribes that honored their dead by eating them
There's some evidence of some neolithic peoples doing this, yes. They're not strongly related to modern europeans.
That's why christianity was progressive
Not really. Literal sacrifice had already been on the wane for centuries before christianity and the evidence for human sacrifice by that point is fairly scant. Mostly Romans talking about their enemies, which is a bit like concluding Iran is making nuclear weapons because CNN said so. Christianity wasn't progressive, it hopped on the bandwagon.
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