There are several words you could use, depending on the specific context and severity:
Formal/Official:
* Excommunication: This is the most common and accurate term, especially in the Catholic Church and some other denominations. It refers to the formal act of depriving someone of the sacraments and fellowship of the church.
* Defrocked: This term is specifically used for clergy who have been removed from their position, often due to misconduct or heresy.
* Deposed: Similar to defrocked, but can also refer to removing someone from a position of authority within the church.
* Disfellowshipped: Common in some Protestant denominations, referring to a formal withdrawal of fellowship and membership privileges.
Informal/Less Formal:
* Ostracized: This implies being shunned or excluded by the church community.
* Banned: Suggests a prohibition from participating in church activities.
* Suspended: This indicates a temporary removal of privileges or membership.
* Dismissed: Can be used for employees of the church who are terminated from their positions.
The best word to use will depend on the specific situation and the denomination involved.