[Petrosius]

Christian is Christian - follower of Christ.

Agreed. I do acknowledge Protestants as Christians. Will you acknowledge Catholics as Christians too?

[metmom]

I have no doubt that there are some Christians in the Catholic church, just as there are some Christians in Baptist churches, Lutheran Churches, Presbyterian churches, Pentecostal churches, etc.

There are also non-Christians in those denominations as well.

Not every person who is in a church or belongs to one is saved. Not every saved person belongs to a church.

Denominational affiliation ≠ Christianity or salvation.