This is one of your odder claims. The English word "church" comes from the Greek "kyriakon" ("House of the Lord").
No Romance languages, Latin included -- and remember that Latin is the official language of the Catholic church -- use a word derived from "kyriakon" or cognate to "church". The word in Latin is "ecclesia". That looks an awful lot like the Greek "ekklesia" to me.
So how is "church" Rome's fault? Because everything is Rome's fault, sooner or later?
Well, perhaps, I should not have blamed the RCC. Several writers in the second/third century AD began to use the term earlier than the RCC existed. Thanks for the heads up.