Debaptism

Debaptism is the practice of reversing a baptism. Most Christian churches see baptism as a once-in-a-lifetime event that can be neither repeated nor undone. They hold that those who have been baptized remain baptized, even if they renounce the Christian faith by adopting a non-Christian religion or by rejecting religion entirely. However, some organizations and individuals partake in the practice.

In addition to de facto renunciation through apostasy, or heresy, the Roman Catholic Church envisaged from 1983 to 2009 the possibility of formal defection from the Church through a decision manifested personally, consciously and freely, and in writing, to the competent church authority, who was then to judge whether it was genuinely a case of "true separation from the constitutive elements of the life of the Church … (by) an act of apostasy, heresy or schism." A formal defection of this kind was then noted in the register of the person's baptism, an annotation that, like those of marriage or ordination, was independent of the fact of the baptism and was not an actual "debaptism", even if the person who formally defected from the Catholic Church had also defected from the Christian religion. The fact of having been baptized remains a fact and the Catholic Church holds that baptism marks a person with a lasting seal or character that "is an ontological and permanent bond which is not lost by reason of any act or fact of defection."

One of the major legal questions regarding "de-baptism" is the question whether a baptismal record is a "registry" or a "database". If it is considered a registry, which is there to document an act that took place, regardless of what happens later, a legal argument can claim that it should not be revised or destroyed. Doing so may in fact not only revise history, but can also be considered illegal by secular law, just as other types of damaging important documents. The person was baptized, and the record should show it. On the other hand, if baptismal records are considered a database, that can and should be modified continuously to reflect the current reality, modifying the record, or even erasing it, can and maybe even should be done. The person does not belong to the Church anymore, and the document, or its destruction, should reflect that reality.

Numerous Satanist organizations and collectives practice "Unbaptism Rituals" to reject the faith that they were raised in. There is no single Unbaptism Ritual adhered to by Satanists, as most organizations operate independently from one another. Notable organizations that offer Unbaptisms include The Satanic Temple and the Global Order of Satan.

In the years 2010 to 2016, 12,442 people "debaptised" in the Dutch-speaking Flemish region of Belgium by formally leaving the Catholic Church.

Resignation from The Church of Jesus Christ of Latter-day Saints results in a revocation of all church ordinances, including baptism.

Using a hair dryer, some atheist groups have conducted tongue-in-cheek "debaptism" ceremonies, not intended to be taken seriously.