I guess, I would like to convey to them that I am definately a Christian, I do not worship ANYONE outside of the Trinity. And I feel that we are all brothers and sisters in Christ.
I wish that all Christians could return to the Catholic Church, but I don't believe they will, so I'm not really concerned about "turning" people. When I answer anti-Catholic questions, my goal is to stop disinformation, not convince the poster that their current denomination is evil, or something.
I'd like to help stop the Catholic bashing and promote a little bit of understanding. When it comes to non-Catholic Christians, I've experienced a lot of compassion and a lot of real ugliness. I'd like to see us treat each other with compassion since we are all Christians.