A more thorough explanation:

APOSTATE

A person who has abandoned their religion or a specific religious belief.

It is also known as apostata (archaic).

• John used to be a devout Christian, but he became an apostate after he started questioning his faith.
• After years of following the teachings of Islam, Fatima became an apostate and left the religion altogether.

These examples illustrate how a person can abandon their religious beliefs and become an apostate. It is a personal decision that can be influenced by various factors such as doubt, disagreement with religious teachings, or personal experiences.