Answer:
Though not an overtly Christian work (there are no priests, churches or religious ceremonies), there are many Scriptural quotations in A Wrinkle in Time. Christ is cited as one of the great warriors of light, next to the likes of Leonardo da Vinci and Beethoven, and many different books of the Bible are quoted alongside of Shakespeare and Goethe and others. Underlying all of this is the author's belief that the core beliefs of Christianity are a powerful force for good in the fight against evil; however, she doesn't go much deeper than that, and uses those Scriptural quotations as a launch point for elaborating on broader themes.
Explanation: