first :

Mcallister is not read john but he killed Patrick family and he came to ask for mercy from Patrick but PJ will kill him 


and why Patrick went to church cuz someone in the end of episode 7 give him little money and told him this is for you after that PJ face and think is changed and he leave everything and went to church  ...i think money is message to him ...



still no one of you know who I s RJ