He has been trolling for a long time and up until now I chose to ignore those kind of people but I see that in the interest of the forum health and transparency all trolls should be at least pointed out.

Definition of a Troll:
"An "Internet troll" or "Forum Troll" is a person who posts outrageous message to bait people to answer. Trolls delight in sowing discord on the forums. A troll is someone who inspires flaming rhetoric, someone who is purposely provoking and pulling people into flaming discussion. Flaming discussions usually end with name calling and a flame war."
"Negative emotions stirred up by trolls leak over into other discussions. Normally affable people can become bitter after reading an angry interchange between a troll and his victims, and this can poison previously friendly interactions between long-time users."

Once I thought that you can have a serious discussion on this forum with everyone without repercussions but I was proven wrong.

Some people just cannot handle a serious and mature discussion and have to resort to insulting, flaming and persecution just to make you feel enough unwelcome, in the hopes that you just leave the forum.

One of his last post that came out of nowhere when I thought he finally got over his Trolling:
Sun, 09/13/2015 - 18:57
"Want a real laugh: read http://www.conservapedia.com/Theory_of_relativity; it reads like it was written by Jeff."
http://www.atheistrepublic.com/forums/debate-room/conservapedia-faschist...

I decided to make this official post not because I care what he says or what other think about me, but because he does this to everybody he disagrees with.
Not everybody is patient or willing to tolerate this childish behavior.
This would end up in Flame wars which should be avoided.

Thus I see this as a threat the the forum health, that should be addressed and also serve as baseline to educate users on this forum.