proselyte
A person who has converted from one religion, belief, or opinion to another.
Noun
pl: proselytes
This term carries a strong connotation of transformation and commitment, often implying a deliberate and public shift in allegiance. While it is frequently used in religious contexts, it can be applied to political ideologies or philosophical systems where a person has been won over by the arguments of another.
Because the word describes a person who has undergone a specific change, it is used as a countable noun. It is distinct from a general believer in that it emphasizes the act of conversion rather than the state of faith itself.
Meanings
Examples
He was a recent proselyte to the cause of environmental radicalism.