Top Definition
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
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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
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
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
Antitheism is an opposition to theism, an antitheist is one who practices antitheism.
Doug is an Antitheist he opposes theism because it postulates an unverifiable hypothesis.
by Donquixote June 15, 2012
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
An antitheist is someone who actively opposes religion or even theism in general, which they make known in an egotistical, cynical, and overall self-righteous way. Ironically, a lot of them seem to enjoy berating and judging the same religious people that they claim behave the same way towards them. Antitheists often think that they are intellectually superior to everyone else, yet they fail to realize that some of the greatest minds in history were theists. These include Tycho Brahe, Galileo, Francis Bacon, Issac Newton, George Washington Carter, and Antony Flew (who was originally a staunch atheist for over fifty years before converting to deism).

However, there is a difference between being someone who simply doesn't believe in God and being somebody who goes out of their way to bully and guilt people for believing.

And before anyone assumes anything, I myself am agnostic.
When an antitheist justifies judging someone because they have been judged, it just goes to show how hypocritical they are.
by Chiminix December 06, 2014
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