A leopard can't change hhis spots, but a person most certainly can change their religion. If the state insists on recording "religion" in the popln registry then it should accomodate the person who decides that their faith has changed i.e. it is up to the person to tell the state what his faith is, it is not up to the state to tell the person.
In three days, Greek coastguard rescues 2,500 migrants (Reuters)
from the article: Israeli author Yoram Kaniuk asks court to cancel his 'Jewish' status