dechristianize

Verb

de-Christianize (third-person singular simple present de-Christianizes, present participle de-Christianizing, simple past and past participle de-Christianized)

1. (British, English, Oxford, US, transitive) To make un-Christian or non-Christian.
2. (British, English, Oxford, US, transitive) To deprive of Christian character or aspect.
3. (British, English, Oxford, US, intransitive) To become un-Christian.
4. (British, English, Oxford, US, intransitive) To renounce one's Christian faith.