Definition of post-Christian in English:
post-Christian
adjective ˌpəʊs(t)ˈkrɪstʃ(ə)n
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 ˌpəʊs(t)ˈkrɪstʃ(ə)n
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.
Definition of post-Christian in US English:
post-Christian
adjectiveˌpəʊs(t)ˈkrɪstʃ(ə)n
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.
nounˌpəʊs(t)ˈkrɪstʃ(ə)n
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.