Truth or trickster (spoilers)
I believe that the writers/producers intent is that Al-Masih is the Messiah. There are acts/tricks that he could not possibly have done if not divine.
(1) He could not have created the sandstorm that defeated Deash;
(2) He could not create a tornado that destroyed a whole town other than the church, nor could he know that a tornado would happen at that time and take advantage of that situation;
(3) he walked on water. Sure that trick has been done by illusionists, but that involves glass structures being constructed under the water. Don't you think that people would have immediately looked for such a structure (this was poor writing as they never addressed this).
Also, the CIA, FBI, etc. make a big deal that he was born, has a brother, has a past, went to college. Jesus had a past before he was declared the Messiah. The fact that he had seen a psychiatrist for a "messiah" complex should be expected if a child/teenager/young adult went around claiming to be the "messiah".
Of course the writers/producers want to keep it vague as it keeps the show going. even at the end the kid who says he saw Al-Masih bring Aviram and his partner back to life was established as a story teller in the beginning of the episode.