In a broad sense, atheism can be defined as the rejection of belief in the existence of deities. More narrowly, atheism is defined as the position that there are no deities, or the absence of belief that any deities exist. Atheism contrasts with theism, which is the belief that at least one deity exists. Those who acknowledge the possibility that a deity exists but do not themselves hold to any belief in a deity are agnostic, not atheistic. Antitheism is defined as an active opposition to theism. In a secular context, antitheism refers to a direct opposition to organized religion or to any belief in a deity. In a theistic context, it may refer to an opposition to a specific god or gods, but for the purpose of this category, we will be using the secular definition. Topics that relate specifically or primarily to atheism or antitheism are appropriate for this category.
 
 
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American Atheists is an organization and magazine that works to advance the civil liberties of atheists in the United States, and to lobby for absolute separation of church and state. Atheism is discussed, as well as the organization's concerns relating to religion, politics, the military, youth, and the family, and particularly the influence of religion in politics and government. A history of the organization, its issues and its projects is included.
http://www.atheists.org/
Offered as a response to religious apologists and missionaries, the site is available in English, German and French, and includes arguments against Islam, Christianity and Agnosticism, with criticism of religious texts, testimonies of bad experiences with Christianity or Islam, examples of what the authors claim to be lies or contradictions, either in sacred texts or in the lives of prominent people with Islam or Christianity. Articles against agnosticism are also presented.
http://www.anti-religion.net/
Purporting to offer an easy-to-use guide to the major arguments for and against religion, the site actually leans toward those supporting atheism. Included are arguments for the existence of God, a section and subsections on defining atheism, including historical and contemporary views. Some famous atheists are profiled, and sorted alphabetically. References and links to additional resources are included.
http://www.argumentsforatheism.com/
Atheist Alliance International
The AAI is an umbrella organization comprised of individuals and groups in the United States, and other countries, who share an interest in promoting the atheist worldview, and which works to develop educational and advocacy programs for the atheist community. Available resources include books, films, news feeds, podcasts, radio and television, scheduled conferences, and a directory of external sites.
http://www.atheistalliance.org/
Online since 1998, the site was originally built around its Yahoo Groups message board, but membership is now required in order to view the discussion board. Site topics include a definition and discussion of atheism and associated philosophies, the paths to atheism, and atheist activism, as well as statistical data. Quotes and writings on the topic are included, with a guide to music, movies, television, radio, books, and other media relating to the topic.
http://atheistempire.com/
Powered by a MyBB script, the forum allows for interactive discussion on matters related to atheism. Registration is free, but required in order to participate in discussions. Topics include atheism in general, news or activism related to atheism, religions, philosophy, the sciences, mathematics, technology, and computing. The rules for participations are published, and there is a section for introductions and personal matters.
https://atheistforums.org/
A non-profit organization incorporated under the Canada Not-for-profit Corporations Act, the organization is dedicated to unifying the demands of atheists in a variety of areas of expression. The site features several articles in support of atheism, and in opposition to religion, as well as online discussion forums, blogs, opinion columns, photographs, podcasts, and other resources, including an online store. An appeal for contributions is made, and volunteer opportunities are posted.
http://www.atheistrepublic.com/
Using a Wiki platform, the site offers a comprehensive examination of atheism from a conservative Christian perspective. Atheism and the atheistic worldview are defined and described, including the various types and degrees of atheism, biblical statements regarding atheism, and criticism. Other topics include atheist factions and infighting among atheist groups, the retention rate of atheism among individuals, and the relationship of atheism to communism, and Darwinism to war, and other issues.
http://www.conservapedia.com/Atheism
Arguing that religious figures are given excessive deference and respect in modern society, while atheists are given far less respect and consideration, the site offers articles, news, book reviews, essays, and other comments largely defending the atheist viewpoint, defining the discarding of religious belief as liberation and the gateway to a moral life filled with purpose and joy. Written primarily by Adam Lee, the author's book, also entitled Daylight Atheism, may be purchased from the site.
http://www.daylightatheism.org/
Arguing that the words "atheism" and "atheist" are often misunderstood or confused with "anti-theism," the purpose of the site is to offer literal definitions that can serve to add clarity to discussions. The definitions of the terms, linguistic structure, etymological support, burden of proof, and further clarification are added, and references are given. Links to national groups focused on atheism are included. Other questions are also answered.
https://www.defineatheism.com/
Freedom From Religion Foundation
The FFRF is an American non-profit organization based in Madison, Wisconsin, but with members in all fifty U.S. states, which advocates for non-theists, promotes the separation of church and state, and offers educational programs and material on matters of atheism, agnosticism, and non-theism. Its publications are introduced and made available, and its legal work and other projects are discussed, including outreach programs and events. Memberships and an online shopping area are included.
http://www.ffrf.org/
Defining a freethinker as one who has rejected authority and dogma, especially in his religious thinking, in favor of rational inquiry and speculation, the site claims to be intended for such, who do hold no belief in God. Claims are made that Thomas Paine, Thomas Jefferson, and other significant people are freethinkers, without belief in God, offering quotes in defense of this position while ignoring those that might be in opposition. News and contemporary science, video and audio are included.
http://www.nobeliefs.com/
The Freethinker was a British secular humanist magazine published from 1881 to 2014, after which it has been published online only. The online magazine takes a positive atheist and anti-religious stance, as it has from the beginning, when it defined itself as "an unapologetically anti-Christian organ." The electronic magazine features movie and book reviews, opinion, and testimonials from people who have become atheist. An archive of past topics is included.
http://freethinker.co.uk/
Founded in 1995, the Secular Web offers essays, reviews, and critiques on a variety of topics relating to atheism, antithesis, and agnosticism, many written by prominent monotheistic historians, philosophers, scientists, and others. A brief history and profile of the site is offered, including its mission and intent. A bookstore reviews and offers for sale a variety of books on the subject, and a library of news and articles are available, some on-site, some off-site.
https://infidels.org/