There is a company, Grace Hill Media, founded by a former sitcom writer and Warner Bros publicist, that markets secular Hollywood films to churches.
Superman Returns (2006) had a similar campaign. Any film that has a potential to be interpreted to have a message of faith is marketed this way.
Superman has always had a messianic theme/interpretation, it was not accidental or unique to the films. Man of Steel the first time to my knowledge, that Kal is 33 years old when he presents himself to mankind, in the 78 film he was 30. There is also the 'Gethsemane' scene that I think is unique to this film as well. Both this film and the prior one featured the 'outstretched arms' imagery.