We do not destroy archeological evidence as we have a sense that everything that is true testifies to God
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Early Christians destroyed plenty of archeological evidence they considered pagan. Statues with noses knocked off was done by early Christians in Egypt and later copied by musselmen. There are hosts of Greek temples and statues destroyed by Christians as late as the 18th century.
You are absolutely right that Christians have not been and aren’t today perfect. But, compared to Communists, Nazis and Muslims, however, we have been exemplary.