post-Christian
/ˌpəʊs(t)ˈkrɪstʃ(ə)n/adjective
1Occurring in or dating from a time after the lifetime of Jesus, or after the rise of Christianity.
2Subsequent to the decline in importance of Christianity in a region or society; subsequent to a person's rejection of the Christian faith.
noun
A person living in a nominally Christian society who has turned away from the Christian faith or has been brought up without reference to it.
Origin
Mid 19th century; earliest use found in Henry Milman (1791–1868), historian and dean of St Paul's. From post- + Christian.
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