Sir Gawain and the Green Knight

I am wondering about the Paganism in this story. The green knight, Green is a color immediately associated with Paganism. Since Paganism is centered around 5 elements(pentacle), 4 of which being Earth, Air, Fire and Water. These elements being all connected with the earth, with all living and growing things, there fore green things. The 5th element is spirit which comes into play with the challenge of Sir Gawain's knightly hood. The color green is also associated with healing and growth. Which Sir Gawain finds out that The Green Knights challenge wasn't in spite or evilness, but to test his self completion? I'm not sure how to say it. But in paganism you don't place your faith in material things, such as the green girdle. Which causes him to be dishonest, because he doesn't tell the lord about it in hopes that it will "save" when he takes the blow from the Green Knight. What he doesn't know is that the Green Knight was testing him. The girdle to Sir Gawain is a a reminder of his dishonest or his unknightlyness, but rather to the green Knight, it is a prize of self growth. There is also the pagan symbol of the green man, which is dated back to the Romans, he is a symbol of all things connected. Maybe there is a controversy over Christianity vs. Paganism in the story.