Baptism is the ritual cleansing of sins. Typically administrered to infants shortly after birth (without their consent) to remove Original Sin, of which they are guilty before even breathing.
Believer's Baptism and/or Anabaptism is a symbolic ritual of commitment, or in sympathy with Jesus' resurrection. It is used as a entry to church communities or in order to achieve a state of "Born Again".
Original Sin is an hereditary sin. It is a sin of which all are guilty by having had ancestors who committed a particular sin. Despite no have actually committed the transgression yourself, you are nonetheless still required to be punished for it.
Having to pay for crimes you do not commit is a human right violation.
The Rite of Debaptism is a secret and powerful ceremony that removes and counters the rites of baptism. This ritual can only be performed by trained and ordained Debaptizors, and is an eternal and irrevocable Rite.
A soul is a thing that, despite being both invisible and undetectable, is considered more important than a living person's happiness, well being and very life. This morally bankrupt viewpoint leads to the devaluing of human life and the reliance on an imaginary afterlife to give meaning to people's lives.
While slightly less heinous then infant baptism, it still presupposes a god who cares more about your soul than your life and happiness. Whether a symbol of resurrection or a commitment to a creed it still requires obeisance to worldview that prizes correct thinking over positive behavior. Debaptism can provide a new symbolism and ritual to ease you away from this morally empty worldview.
Technically, no. Just like you can't open a box that doesn't have a lid, you can't remove a baptism that hasn't been performed. But, like all good religious doctrine, there is a loophole.
If a debaptism is performed on a person that has not been baptized, it will create a sort of "baptism debt". In mathematical terms, an unbaptized person would have a baptism state of 0. If that person was debaptized, they would become -1 baptized. It would require 2 baptism to then equal a baptism state of 1.
This is why we may perform debaptisms on people who have never been baptised.