Are you quibbling with the word certain, WB. Because if you are not certain that the life force does not originate from the corporeal, then you are proving my point that you are a materialist and all is right in this world as no incongruity exists.
I am not the one quibbling. I am the one stating his beliefs. You are the one who made a blanket statement about atheists, and then spent page after page after page trying to argue that someone's personal beliefs are wrong because they do not agree with your blanket statement.
The bottom line is simple. You claim all atheists are materialists. I explain that I an am atheist (I do not believe in God) and yet I am not a materialist because I do not believe everything originates from a corporeal source. After that it is just you demanding that I prove things. There IS no proof.
I am certain what I believe. But that has not mattered to you in the least.