Fellow Atheists I Need Your Help?

Okay so I have recently converted to atheism and today I some texts from my cousin about my beliefs. No one in my family likes my decision and very often when I am with my cousins we start arguing mainly because they bring it up. So then my cousin told me that she is going to bring our entire family over to my house(btw I'm 16) and have me explain myself to them. Do you think this is right? I already explained myself to my parents and defeated them in a debate. I have a lot of relatives so there are going to be like 12 people coming over and I think they are just going to badger on and on about miracles and the bible and the so called god loving everyone and how I am wrong and they are right. Note that my cousins say that our souls feel pain and that's why we are able to feel in heaven. I tried explaining to her that without a brain and nervous system you cannot feel anything or think anything. What should I do? They want me to explain myself and are always trying to convert me. My mom wants me to read this book of a saints life that preformed so called miracles. I am just so confused I do not know what to do. I might just get overwhelmed and not be able to say anything because they are all going to be at my house. And they are constantly discriminating against me because of my beliefs. What should I do tomorrow?