Check out this link from the Vatican website:
Basically you have to mentally renounce, realize the "external manifestation of that decision", and "reception of that decision by the competent ecclesiastical authority".
Easy enough. Except if you look at #7:
7. "It remains clear, in any event, that the sacramental bond of belonging to the Body of Christ that is the Church, conferred by the baptismal character, is an ontological and permanent bond which is not lost by reason of any act or fact of defection."
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Catholic AnswerThe document above spells out the way that it is necessary to formally renounce the Catholic Faith. This has the result of rendering you no longer subject to the laws of the Catholic Church. As they have pointed out above, your Baptism makes you ontologically something else: a child of God, and there is nothing that any human can do to "undo" that.Just renounce god all together
Roman Catholic answer. Renouncing your Catholicism is a *very* serious step, and should only be taken after much consideration and study. First one should talk to a priest to find out the different consequences of such an action. I believe there is a definite procedure that one can follow if one has thought this out, and prayed about it. But it is very serious, and has *eternal* consequences, so one should not take such a step lightly. Please call a priest and talk to him.
Otherwise, your decision not to be a Christian can be entirely private, with no need to tell anyone else. A somewhat more public way of renouncing Christianity is to quietly tell some friends or relatives that you are no longer a Christian. Joining another religion, such as Buddhism, also effectively ends your association with Christianity. Finally, you can also contact your former church and ask to have your name removed from its register of baptised members, although few bother to do so.
Answer
It is to having once known that Christ exists as the son of God, then coming out in open denial off such an existance. Usually this is replaced with some other belief which does not include Christianity.
He refused to sacrifice to pagan gods and renounce Christianity.
George refused to renounce his Christianity and sacrifice to pagan gods.
The most memorable thing said by Saint George was, "No, I will not." when told to renounce his Christianity or be executed.
He refused to renounce his Christianity and sacrifice to pagan idols. For this he was martyred under orders from the Roman Emperor Diocletian.
i am going to renounce my job.
I can not renounce my love enough. He renounced his love.
I renounce my loyalty to your reprehensible organization!
Catholics renounce Satan when they are baptized, if they are too young to do this, then their parents and sponsors renounce Satan for them.
The Roman emperor had all Christian soldiers arrested and gave them a choice of renouncing Christianity or being put to death. George refused to renounce his faith.
One famous phrase attributed to Saint Cecilia is "Sing unto the Lord a new song," which reflects her devotion to music and her Christian faith.
The main reason that Christianity has prospered is that God has caused it to prosper. Another reason is that the early Christians were ready to die a horrible, painful death rather than renounce their beliefs; which drew people by the thousands(which is the reason that the Chinese church is so huge today).
Ana was a young Chinese woman and a Christian. In 1910 the government enacted a law forbidding the practice of Christianity in that country. When Ana refused to renounce her religion she, along with thousands of others, were martyred.