I am in agreement with you on this brother. It is unacceptable for a single organization to "copyright" a term that encompasses an entire people. The one, true church Jesus spoke about establishing was clearly a living organism, not an organization. WE are all members of his body, the CHURCH, which is the called-out assembly of all true believers in Christ for all time. Even those before Jesus came to earth that believed God's promise of salvation are members of this body. When one specific group wants to claim proprietary use of the word "catholic church" - which simply means universal - and then boasts of its 2000 year history, we who are part of the real church can claim that we can go back to Adam and Eve because even back then God communicated his redemption plan and they were the first members!
You are as free to your opinion as Catholics are to theirs. Do not, however, expect the Church or Catholics to compromise their identity or lexicon for your sake. We are perfectly happy with it as it is.