God Friended Me wasn’t really about whether or not the entity behind the account was really the God (or even a God), but it was about opening Miles up enough that he would be willing to consider other view points and think more deeply about his own faith, or lack thereof.
While it’s kind of a bummer to not get a definitive answer to who’s behind the God account during the two-hour finale, Bryan Wynbrandt makes a very good point.
Following the friend suggestions of the account not only led him to Cara, but others who were able to help him develop as a person, and even help him investigate new friend cases.