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1.
A person who holds the view that organized religion when considered throughout the centuries has been a destructive force in society, wrongly believed is that all are also agnostics or atheists, but a great number of faithful theists also see organized religion as harmful to society and choose to follow their own path to god.
when considering the crusades, September the 11th, the holocaust and the Spanish inquisition the anti-theist concluded that religion had caused great harm to society.
by hairy_palms May 17, 2007
 
2.
An antitheist is one who is strongly apposed to the belif and following of theism and belives that it is detremental to society. More or less a hardcore atheist.
Antitheist - Religion is kiling society.
by Mr.Universe November 27, 2005
 
3.
Actively opposes a belief in gods of any sort and to institutions built around belief in a deity. They believe that religion is harmful to individuals and society and that it impedes scientific progress and encourages immoral acts.
An anti-theist may see religious harm in the brainwashing of children, faith healing, circumcision, holy wars, terrorism, the inquisition, blood sacrifice, and discrimination against homosexuals and women.
by kookycole May 26, 2012
 
4.
A person {often, but not always an atheist } who believes religion and/or theism to be a detriment to society

an active atheist, usually publicly denouncing religion, theism, and churches/mosques

Someone with a brain
"Hey, I'm an antitheist"

"What? I thought you were an atheist.."

"I am both! I both lack a belief in a god AND oppose religious institutions"
by That Humanist Chick September 23, 2009
 
5.
A person whom realizes the harm religion has caused and is still continuously causing to humanity and actively opposes it.
Anti-theists tend to be predominantly atheists,agnostics,deists,pantheists and spiritualists.
Most notable anti-theists/militant atheists:
Richard Dawkins
Christopher Hitchens
Sam Harris
David Silverman
Thomas Jefferson
Madalyn Murray O'Hair
by Znk666 June 05, 2012
 
6.
An atheist idiot with such an irrational hatred for theism that they actively oppose it aggressively. They are so brain washed by their atheist propaganda that they actually think that science debunks God.
Tom was an antitheist idiot.
by Skialian January 23, 2014
 
7.
An Antitheist not only lacks a belief in God(s) and the supernatural but also thinks it is our responsibility to undo, and prevent futher, retardation of society caused by the actions of people in the name of their imaginary God(s).
As an Antitheist, it is my duty to the future to tell children that, no matter what anyone tells them, they won't burn in hell for not believing religious nonsense.
by Uncle Matt 69 September 14, 2012