Catholicism is not the "Same as" Christianity.
According to Catholicism, Catholicism is the correct expression of Christianity.
In the same way, Protestantism is not the "same as" Christianity.
Also, American Democracy and French Democracy are not the "same as" Democracy.
The OP is creating an apparent, but actually nonsensical, terminology paradox in order to imply that Catholicism is not Christian. The OP is implying: Catholicism is not the "Same as" Christianity, therefore Catholicism is not Christian.
This is because in the third post, the OP followed his/her statement with: "But don't they go against some things of the bible."
Whether a group, like Catholicism or Protestantism goes against something in the Bible (like circumcision or ritual sacrifice - in the Torah - or accepting that a saint's clothes could cause miracles - in Acts 19) does not automatically mean that the group is not Christian. The OP however is trying to imply this regarding Catholicism.