The Role of Religon.

Frankenstein was written during the time of the Enlightenment; the literary movement for authors who wrote based on "evidence of their own eyes and ears, human understanding, and logical reasoning." They would then reject scientific and religous ideas. If this is the case, why did Mary Shelley have Justine portray someone who beleived so ardently in her faith? She went through with the claim that she had murdered William to obtain absolution, even though she had no part in the murder. She was more fearful of being excommunicated from the church then she was of death itself. My question is what was the intent behind Justine's scene of religious conviction? If the Enlightenment's focal point was to stay clear of matters concerning religon.