I thought Concerned Women for America and other similar groups were warning parents in the 90s that the classic Wrinkle in Time WAS new-agey and anti-Christian.
On the other hand, she was explicitly, devotionally, bottom-to-top Christian in her imagination, her symbolic framework and her moral code, and thus scorned by secularist and leftist critics.
Despite some displeased critics on both sides, she certainly triumphed with her audience, several generations of children and young adults in the mid-to-late-20th century. She writes beautifully. People literally do pass her books on from generation to generation.