Are my brother via parentage? No
Are you my brother in arms? No
Are you my brother in my struggle to achieve the goals set ahead of us? No
You are not my brother.
I was born Episcopalian, I am an atheist, because I don't believe in your God, I believe in stuff I can see and feel, stuff that's inherently within people.
Not your book
You should not have come here to convert or persuade us, because many of us are bitter towards religion in general, not even counting those who have suffered at the hands of the Catholic Church.
You'll have to pardon my disinterest in buying indulgences, but I'd rather walk out of my house and be my own man, than follow the "strong moral and ethical, except when it serves out purposes to behave otherwise" code that the Catholic church spouts at us.