A Wrinkle In Time research

To understand more deeply the themes in A Wrinkle In Time,  I first looked up the author. I found her Official Site, and was informed of many things that surprised me.
I had picked up throughout the book that the Murray family was undeniably Catholic, but I had no idea what christianity actually meant to the book.  L' Engle worked as a librarian at The Cathedral Church of Saint John the Divine for over 30 years, and was always extremely devout.  One of her books is titled "Walking On Water" and she writes repeatedly of God and greater powers than humans in her various poetry books.
The idea of greater powers is very much in fact what sparked the idea of A Wrinkle In Time.  Madeleine L' Engle often dabbled in thoughts of what was outside her own world, and Meg is thrown out in to a whole, huge world. Bigger than she ever imagined, where she learns that there are powers much greater than herself-Good and bad.
The three witches are on the good side, and Calvin even calls them "Guardian Angels, Messengers of God."  They represent some of what God stands for: Love, individuality, free will, and moral.
The Black Thing and IT are on the bad side, and represent Biblical sins. On Camazots, IT controls everyone's mind (DEFINITELY against the bible), and leads a nation through conformity.
The way IT leads Camazots has been called over and over a communism, and communisms, are, well, not saintly. (Look, I don't know much about God and religion, but I'm pretty sure these things are not good.)
If IT's ways don't actually fall under the seven deadly sins, I'm sure God still disapproves.
Also, when Meg and her comrades are on Uriel, the creatures sing a song that translates into the words of Isaiah.  AND the Gospel of John is quoted.
I'm sure I could keep going, but I really don't know anything about religion.  So I'm going to stop here.
Another deep connection in A Wrinkle In Time is to the Cold War.   Camazots, with everyone under the control of IT, can be thought of as the soviet union. Our world, Meg's life is the West.   When fighting a mind-battle against IT, Meg quotes The Declaration of Independence.
"... All men are created equal."
"But don't you see, Meg, that is what life on Camazots provides us......."
"Like and equal are not the same thing at all!"
In quoting The Declaration of Independence, it becomes clear that the author is speaking about the Cold War.
Another theme in the book is the moral intelligence of children. Madeleine L'Engle never got very good grades, but she was always very smart, with lots of things going through her brain. In her introduction to the audio-CD version of the book, she complains about having to go to many publishers before finally getting someone to publish her book.  She says that, well, it's because they were grown-ups.
"The trouble with grown-ups, you see, is that they spend too much time in their little offices with the closed windows and the closed doors; and they are never open for new ideas, whereas children are always open for new ideas."
In the book, Charles Wallace is the smartest of them all. Although he doesn't talk, and everybody says her and his sister are "not all there", they are two of the smartest children around.
 I wonder If Madeleine L'Engle meant to connect them to herself.  She was quite an interesting person, and i wish I could have met her.