Sir Gawin and the Green Knight Part 4

I am almost done with this story........... Ok in the final part of this story it mimics the beginning of part 2 with the description of the concept of passing time and the description of the atmosphere.
Gawain begins by putting on his armor and leaving the castle and his attitudes shows that he is not in the mood for these games anymore. The most important part of this passage is when Gawain sets out to find the Green Chapel. There is a correlation between the dates of when the Green Knight's beheading occurred and when Gawain set out to find the chapel. The green knight is able to heal from his decapitation and then he punishes Gawain for not decapting him.
This part of the story does not make any sense to me.
Basically all Gawain did was scratch him and the Green Knight is mad.
I feel like the Green Knight is trying to represent God in this story, by not killing Gawain even though he was sharping an axe, and he also frees Gawain from the sin of lying about the girdle. If you were raised in the church you know that know mortal has those types of powers to free anybody from anything. So the author leads me to believe that the Green Knight was God, because he was not harmed during the "scratching" incident and then he also forgave Gawain that indicates to me that the Green Knight was a larger than life character, example God.