backslider
A backslider is a term used in religious contexts to describe someone who has abandoned or renounced their former religious beliefs or practices. The term often implies a sense of falling away from a state of spiritual commitment or adherence to doctrine. It can be used both by those within a religion to describe members who have left, and sometimes by former members to describe themselves or others who have become disillusioned.
The concept of backsliding can carry negative connotations, suggesting a failure to maintain faith or a moral