Praeparatio Evangelica, or preparation for the Gospel, is a term used referring to the belief that God has sown seeds of the gospel message in other cultures that will only fully bear fruit with the arrival of the message of Bible. Don Richardson believes that redemptive analogies, stories or images within a culture that express in some way the Christian gospel message, is a form of this preparation of the Gospel. With this thought, redemptive analogies are discovered rather than created.
This point can be questioned. The Bible uses Roman adoption as a redemptive analogy. Does this mean that God created the adoption process within that culture so as to provide a way of expressing an honor-shame redemptive analogy to contrast the guilt-innocence redemptive analogy associated with the Roman justice system (which then was also created by God)? Still there are missionary stories of redemptive analogies within a culture that seem too good to be accidents. More broadly, can truths in other religions be said to have been created by God to prepare for the full gospel, or should they be seen as man-made expressions of human longings that can be used as bridges for the gospel.
Rowan Williams speaks of the Magi in terms of the how other faiths can serve as a preparation for the gospel. He notes how the Magi, perhaps Zoroastian and most likely drawing from the long-standing tradition of astrology from Babylon and Persia, were led by a star. Williams notes that the star led them to close to the new King, but ultimately to the wrong house. The limited understanding that their belief system contained brought them to the court of Herod the Great, not to a house in Bethlehem. It actually took Holy Scripture to bring them the rest of the way. This could point both to the possibility and limitation of this preparation. Ultimately, the Magi found the Christ, while those who had the Hebrew Scriptures in the palace in Jerusalem did not bother to travel approximately 10 kilometers to see for themselves. <Refer to N.T. Wright’s podcast, “#49 Other Faiths, Judaism and Gnosticism,” Ask N.T. Wright Anything. December 18, 2020.>