Why would this grown man, an atheist, behaved as a jerk? 

The fact that many people in the world are assholes. 

When atheists behaved as assholes, they could blame their beliefs system. It is all on them.

This is the 2nd posts on this jerk writer C. J. Werleman.

Reason, he was not only discovered to be plagiarizing, he also was discovered to be the man behind this "Women4Atheist" account.

Details in the link.

Well, I always thought that writers who create sockpuppet accounts are losers and to be, is a good indicator that they are bad writers.

Case in point.  

I couldn't say I'm not disappointed. I would expect a bit more from a person who is not religious deluded. 

But I guess he did have a religion of one. 

C. J. Werleman is a twat that spread wrong information against Sam Harris. 

What a jerk. 

Readers could not trust writers who have lied repeatedly against another person. Why would he do that? Well, he is a nobody and Sam Harris is a somebody.

I'm glad that Alternet removed him from the site. 

https://richarddawkins.net/2014/10/alternet-removes-cj-werlemans-articles-from-site-following-plagiarism-accusations/

"Dear Reader, it is with regret that we announce that frequent AlterNet author CJ Werleman was discovered to have failed to attribute text taken directly from other news and information sources. AlterNet takes allegations of plagiarism seriously, and has removed Werleman’s articles from our archives. Our apologies to the various sources and writers whose work was misappropriated in Werleman’s articles published on AlterNet."

What a disgrace. 

No. I'm not going to read any of his books as I do know want to remember any false information presented in his work.