I wonder what tod was

the wolf or fhe one killing the sheep cuz metaphorically dennis was the fallen sheep

The plot is Dennis being tested by God. His story parallels the one with Even and the garden of Eden.
The test is choice between obedience to God or self willed desire.

Boss-god
John- apostle
Dennis-parallels Eve. Is gods follower.
Todd-devil
Sheep-symbolize innocence, purity, gods followers