I think the movie was right on target.
Praying to God was one of the changes in the NT.
For example, you would praise RA, but you would pray to the other gods. This is because RA was the MAIN god. And the lesser gods you would pray to for personal favors. But you did not ask the Main god for personal favors, you would just praise the main god.
The Christian religion started out as Gnostic, therefore you would just praise god. Then the Roman version took over and the meaning of god changed and then you would pray to god.
You can see this from the Gospel of Thomas that was found in the Nag Hammadi Library. In the secret sayings which the living Jesus spoke and Didymos Judas Thomas wrote down. These books did not meet the Roman standards and were therefore left out of the bible and banded.
(6) His disciples questioned him and said to him, “Do you want us to fast? How shall we pray? Shall we give alms? What diet shall we observe?”
Jesus said, “Do not tell lies, and do not do what you hate, for all things are plain in the sight of heaven. For nothing hidden will not become manifest, and nothing covered will remain without being uncovered.”