Deconvert

She has deconverted from Christianity, Islam, Judaism, etc.

They tried to deconvert him.

1961, Catholic University of America, Herman Joseph Heuser, The American Ecclesiastical Review, Catholic University of America Press, etc., p. 236, The very devout and older Catholics are naturally inclined to see in the sudden North American fury to deconvert and decatholicize Hispanic America an enterprise that is not inspired by Christ but by the Devil, some sort of spiritual rape of the Latin republics.

2005, Anne Schiller, 'Our Heart Always Remembers, We Think of the Words as Long as We Live': Sacred Songs and the Revitalization of Indigenous Religion Among the Indonesian Ngaju, read in Pamela J. Stewart, Andrew Strathern (editors), Expressive Genres and Historical Change: Indonesia, Papua New Guinea, and Taiwan, Ashgate Publishing Ltd, →ISBN, p.111, Some older adherents of Kaharingan reportedly deconvert from the traditional faith to Christianity for fear that their offspring will not conduct proper mortuary rituals on their behalf when it becomes necessary.

Oh, I'm not going to try to deconvert them. No! Let them keep their faith, if they like it.

The sociologist studying Mormonism is not out there to deconvert people, engage in historical or theological debates, destroy worldviews, or the like.

2005, Alexander Gelbukh, LINK (Online service), Computational Linguistics and Intelligent Text Processing: 6th International Conference, CICLing 2005, Springer, →ISBN, p.373, To generate the MA corresponding to a UNL graph, generate an “extended instance” of the UNL graph for each possible variant in that language, deconvert these UNL graphs, then continue as with normal translation...

We must arrange to deconvert chartered vessels if the owner so desires. He may want them put back in the same condition as when chartered.