when one goes outside the ‘Christendom’ situation to bring the Gospel to non-Christians, one soon discovers that the doctrine of the Trinity is not something that can be kept out of sight; on the contrary, it is the necessary starting point of preaching.
(Lesslie Newbigin, Trinitarian Doctrine for Today’s Mission, p. 35)
And to the extent that contemporary Western culture has gone outside ‘Christendom’ …