Basically the wife is the the one in charge of the cult. The dude is just a charismatic front who talks a lot of shyt and gets people to join. When put under pressure he cracks (dinner party where he calls that guy questioning him a pigfukk 

). The wife is the backbone and all the beliefs come from her. She is too calm and cold to be able to recruit though.
Joaquin's character is an immature guy who cant control his urges (sexual, violent, etc.) who gets taken in by the Master and basically treats him as his loyal guard dog. He tries to teach him the cult's beliefs but Joaquin had to find his own way in life and learn to control himself mentally. He finally makes a breakthrough when he visits his ex gf's mother and stays calm and accepts that she is gone and happy. He ends up in a relationship at the end and seems to have found happiness.