It would depend on what you mean by "Christian". If you use the broad term meaning anyone who believes in God then maybe but if you mean the more narrow term "being save by the blood of Christ", "excepting Christ as your personal Savior", then no. I would argue that in order for one to be a Christian, one must except Christ as their personal Savior. This view does not overwhelm the Catholic church or their members.
Amen, and the feud between Protestants and Catholics reside in the two faiths, in such as this:
Christians believe in Christ alone for salvation
Catholics believe there isn't any salvation outside the Catholic church
Christians believe that Christ's final sacrifice on the cross is enough to justify the forgiveness of sin
Catholics believe that pennance is the restitution for forgiveness for sin.
Christians rely on faith, not of works
Catholics believe in works to gain favor.
This is just a few of the differences that cause the heated debates