He is a priest of a cult of ghouls who worship radiation and believe in living for eternity by becoming ghouls through bathing in and or even consuming radioactive materials. They also believe in a Ghoul Jesus. The Eternal Life Priest himself is a very mild mannered and sophisticated individual. He is more than happy to give complex and detailed sermons as well as welcome more people into the church. 

As the Eternal Life Priest is a ghoul, you should have a rasp like Hancock from Fallout 4 as shown by this video: https://www.youtube.com/watch?v=Qbg0QVIpxiU

Record all audition lines while referring to the notes below for each line and do one take of each line. 

For the first audition line, you are very surprised that there is a newcomer with such a distinct personality and appearance arriving at your church. You haven't seen someone like him/her in ages. His/her arrival has genuinely piqued your curiosity and interest. You find yourself compelled to learn more about him/her and see how they will interact with the church. You are also slightly cautious as his/her intentions are not completely clear, but still courteous and polite. 

For the second audition line, you are giving a detailed explanation to the courier about the ways of the church. You really want them to know the values of your church. You hope that this courier will embrace the church after your detailed explanation so you're trying to explain the church as engaging and interesting as possible. You are also appearing very intellectual and sophisticated in thinking and personality. 

For the third audition line, you are incredibly disgusted by the player. You see him as the person who will bring destruction to all that you love and the church itself. You will give your life to prevent this demon from fulfilling his goals. You are going to banish this unholy beast from this world. You feel that violence is now the only option in dealing with this individual and that you will be making the world a better place by removing him.