I assumed this was a lead-in to some justification of Christianity. Guess I was wrong.

The simplest theory that makes the same prediction has a greater utility because it is easier to apply. It's basically the "condensed version." Any additional variables in T1 are functionally irrelevant. Those variables may as well not exist, and for practical purposes are not worth considering. All the relevant information is contained within T2 and considering anything beyond that is useless.

There's greater utility in T2 because there is no chance of God "getting in the way."