Religious brainwashing is child abuse.

Wikipedia

Religious indoctrination, the original sense of indoctrination, refers to a process of imparting doctrine in an authoritative way, as in catechism. Most religious groups among the revealed religions instruct new members in the principles of the religion; this is now not usually referred to as indoctrination by the religions themselves, in part because of the negative connotations the word has acquired. Mystery religions require a period of indoctrination before granting access to esoteric knowledge.

As a pejorative term, indoctrination implies forcibly or coercively causing people to act and think on the basis of a certain ideology. Some secular critics believe that all religions indoctrinate their adherents, as children, and the accusation is made in the case of religious extremism. Sects such as Scientology use personality tests and peer pressures to indoctrinate new members. Some religions have commitment ceremonies for children 13 years and younger, such as Bar Mitzvah, Confirmation, and Shichi-Go-San. In Buddhism, temple boys are encouraged to follow the faith while young. Critics of religion, such as Richard Dawkins, maintain that the children of religious parents are often unfairly indoctrinated.