I don't understand your comment. Please elaborate on how Catholics deny their Christianity.
Example: I struck up a conversation with a complete stranger in a hotel lobby one day, and in due course asked him if he was Christian. His reply was, "No, I'm not Christian, I'm Catholic." This was odd to me, so I asked him if he thinks you have to be Protestant to be Christian. He said he thought so. The point is, until about 1930 the term Christian was generally synonymous with Catholic. But then for some reason, it became less popular for Catholics to use the title of their ancestors in the Faith. Certain outspoken and enthusiastic Protestant groups were using it instead, and Catholics backed away from it. When they did so, their vacancy with the name left the opportunity for evangelicals and pentecostals to usurp the name "Christian." Since Catholics are generally less outspoken than Protestants, the popular usage of Christian started to change its meaning. We are now in a sort of recovery phase, in which Christian means different things to different people. What does this all mean in the progress of religion in history?