dear lord, poor o'connor must be rolling in her grave (no offense)...i've not read this one, but i have read wise blood by her and i've done research, so i know she writes on basically the same theme: grace and redemption. Basically if you accept God's grace (that Jesus died on the cross for us to save our souls), then you are redeemed, meaning you are saved and can go to heaven. you following so far? now let's work on that paragraph:
1. after O'Connor, put a comma.
2. every detail is symbolic? wow what depth...not (sorry to be sarcastic, that was rude, i know. but come on, you can do better!) is there any way you can re-word that to add something about religion, since that's what your paper is on??
3. Sentence 2 - The Grandmother, as the only vibrant character, symbolizes the search for redemption (or something along those lines)
4. sentence 3 - The story is a spiritual journey for the Grandmother, because of her troubles, such as (list)
5. That's not the end of the paragraph is it? keep going! add details...you're going somewhere, so know follow that! (grandmother's journey from superficial and materialistic to religiously devoted and redeemed - i'm guessing, since i didn't read it, but you should know the answer to that!)
6. remember to SHOW not just tell...i'm glad the book "symbolically represents" stuff...but what? what do certain things represent? what proof do you have? (i.e. use quotes! your teacher will love it!)
p.s. of course the book is "religious in a sense" -- here are some quotes by the author:
"All my stories are about the action of grace on a character who is not very willing to support it, but most people think of these stories as hard, hopeless and brutal."
"When a book leaves your hands, it belongs to God. He may use it to save a few souls or to try a few others, but I think that for the writer to worry is to take over God's business."
here try this for more help:
http://www.enotes.com/good-man
good luck!