R, huh? You going topless for this or cutting an eye out or something? How many F-bombs are you allocated if you warn your congregation of the rating in advance?
Heh. Nothing like that... but here's what makes it R (and the congregation will be warned well in advanced with alternative to the service).
Baal worship proliferated largely because of its religious requirements. Baal was the god of the storm and thus, the god of crops. Baal worshipers believed if they needed rain to help their crops, the only way to do so was to entice Baal into ejaculating upon the earth (yes... they thought this was rain... and yes... ewwwwwwwww).
In order to get Baal to do this, they staged massive orgies. The sexual deviance and physical abuse that happened at these things was incredible. They believed it needed to rise to this level in order to arouse this false god.
Naturally the resulting children were often sacrificed to Baal.
So, no f-bombs, no actual nudity, or physical portrayals of violence. But I think the description rises to an R rating