> A cult, as used in the context of Christianity, is any belief system which differs significantly from the beliefs or practices which are regarded as normative expressions of a particular religion.
Then Protestantism is a cult if you're a Catholic. And vice-versa. Christianity is a cult if you're a Jew.
"Cult" is a loaded word.
Apparently you still don't understand simple concepts. Protestants and Catholics agree completely on the fundamental belief of Christianity. They disagree on forms of worship and church government. Please, go get educated.