Anonymous Christian is the controversial notion introduced by the Jesuit theologian Karl Rahner (1904–1984) that declares that people who have never heard the Christian Gospel might be saved through Christ. Non-Christians could have "in [their] basic orientation and fundamental decision," Rahner wrote, "accepted the salvific grace of God, through Christ, although [they] may never have heard of the Christian revelation."
Theologians William David Davies, W. D. Davies and Dale Allison wrote that proponents of the notion find scriptural support in Romans 2:14-16, as well as in Matthew 25:31-46.
The notion of inclusivism, for which Rahner's Anonymous Christian is the principal Christian model, is "the most popular of interreligious postures."
Karl Rahner accepted the notion that without Christ it was impossible to achieve salvation, but he could not accept the notion that people who have never heard of Jesus Christ would be condemned.
Anonymous Christianity means that a person lives in the grace of God and attains salvation outside of explicitly constituted Christianity — Let us say, a Buddhist monk — who, because he follows his conscience, attains salvation and lives in the grace of God; of him I must say that he is an anonymous Christian; if not, I would have to presuppose that there is a genuine path to salvation that really attains that goal, but that simply has nothing to do with Jesus Christ. But I cannot do that. And so, if I hold if everyone depends upon Jesus Christ for salvation, and if at the same time I hold that many live in the world who have not expressly recognized Jesus Christ, then there remains in my opinion nothing else but to take up this postulate of an anonymous Christianity.
According to Rahner, a person could explicitly deny Christianity, but in reality "existentially is committed to those values which for the Christian are concretized in God."