Given that even old pagan temples got repurposed (like for example the Pantheon https://en.wikipedia.org/wiki/Pantheon,_Rome ), I don't think that statement holds in a general sense.
There might have been local destruction by Christians but not a systematic destruction lead by the church.
Often, old buildings were used as resource for new buildings as the common people didn't regard those old buildings as anything else than a quarry.
There might have been local destruction by Christians but not a systematic destruction lead by the church.
Often, old buildings were used as resource for new buildings as the common people didn't regard those old buildings as anything else than a quarry.