As the same words in the Question [“What is the Protestant answer to 'Is Catholicism Christian'?“] do mean different things to different people, it is important to understand the meaning of the actual terms used before the actual Question can be accurately answered.
What is a Protestant?
A "Protestant" refers to someone and/or organization who came out of the Roman Catholic Church "in-protest" at the Reformation.
For example, one of these organizations was the Church of England, (also known as the Anglican Church and Episcopalian Church in USA).
Catholicism
The word 'Catholicism' used to refer to the whole body of believers, whereas now it only refers to part .
In recent years the Roman Catholic Church [abbrev. RCC] has deliberately hijacked the term and calls Roman Catholicism as 'Catholicism'. The public now sees no difference. For example, the 'Collins Dictionary' defines 'Catholicism' as
'usually refering to the Roman Catholic Church.'
Christian
There is a difference here. A person can call themselves 'Christian' but not actually be one. A 'Christian' [with a capital 'C'] means a follower of the teachings of Jesus Christ, while 'christian' [with a small 'c'] simply means exhibiting Jesus Christ's virtues such as kindness or goodness or helping others. For example, a person who is 'born-again' would regard themselves as a 'born-again believer' or a ' true Christian' but other 'believers' as just ' 'christian' or 'nominal christian' .
Christianity is properly defined by certain doctrines that are revealed
in the Bible.
It is not defined by simply saying that as long as you believe in Jesus, you're a Christian.
Is Roman Catholicism a Christian institution ?
Although there are Christians
in the Roman Catholic Church, the Roman Catholic Church
as an institution is not Christian: it is descended from Mithraism, and Mithraism came from the Babylonian amystery Religion. The Roman Catholic Church
as an institution is itself pagan.
In summary,
Although Roman Catholicism as an institution is definitely NOT Christian, some individual Roman Catholics are Christian.
Catholicism was the first Christian religion.
you can just be Christian as Protestantism and Catholicism are separate parts of Christianity
There is no specific ceremony for a Protestant converting to Catholicism, but anyone entering Catholicism must be Baptised.
Anyone who wants to can convert to Catholicism.
Lucille Ball was a Christian. She was raised a Protestant, but her first husband, Desi was a Catholic. So, after their marriage, she tried for a while to learn Catholicism, but stopped when she realized it wasn't helping Desi any.
Roman Catholicism. .................................... Christianity is the religion. Roman Catholicism is one church or major division within Christianity. The Protestant Church and Orthodox Church are other major divisions.
He converted from Catholicism and became a Protestant.
Protestant Christianity
No. The Protestant Church was founded by Martin Luther, a German Priest in the 14th century after seeing too much corruption in the Medieval Catholic Church. The center of the Protestant was to Protest against the Protestant Church, hence the word "Protest" in Protestant.
Elements of Catholicism
No. She was Protestant but converted to Catholicism .
The most common religion is Roman Catholicism.(catholic)