Since denominational affiliation does not dictate whether one is really a Christian or not, it's a meaningless question.
There are Christians and non-Christians in every denomination.
Being a Catholic does not by default mean being a Christian. Neither does being a Baptist, Methodist, Lutheran, Pentecostal, or whatever flavor of religion you choose.
The only thing that varies from denomination to denomination is the percentages of Christians in each one. Some are more likely to have more because they teach the truth, than others.
I interpreted it to mean do I think that the RCC teachs the core Christian doctrines.
That they ALSO teach some stuff that I do NOT consider to be important was not addressed.
ALL churchs do that!
Jesus answered, The work of God is this: to believe in the one he has sent.
1 John 3:21-24
Dear friends, if our hearts do not condemn us, we have confidence before God and receive from him anything we ask, because we keep his commands and do what pleases him. And this is his command: to believe in the name of his Son, Jesus Christ, and to love one another as he commanded us. The one who keeps Gods commands lives in him, and he in them. And this is how we know that he lives in us: We know it by the Spirit he gave us.