Christina is a regular atheist correspondent for AlterNet, Free Inquiry, and The Humanist, and has been writing about atheism in her own "Greta Christina's blog" since 2005.
Her blog is now part of The Orbit, the "first atheist media site founded explicitly to work on all forms of social justice."
In 2009, Hemant Mehta at the "Friendly Atheist" ranked Christina's blog in the Top Ten most popular atheist blogs.
She also created the "Atheist Meme of the Day" on Facebook.

She has been writing professionally since 1989, and has been a full-time freelance writer and speaker since 2012.
Her writing about atheism has appeared in print in Skeptical Inquirer and the anthology Everything You Know About God Is Wrong, as well as in her own books Coming Out Atheist: How to Do It, How to Help Each Other, and Why (2014) and Why Are You Atheists So Angry?:
99 Things that Piss Off the Godless (2012).

Speaking to Chris Mooney for a Point of Inquiry podcast in 2012, she stated that "there isn't one emotion" affecting atheists "but anger is one of the emotions that many of us have ...[it] drives others to participate in the movement".
She feels that there are many goals for the atheist movement — more separation of church and state, ending "bigotry against atheism", and for some, persuading people "out of religion".
She thinks it is a "valid goal" to work towards a world without religion.

As a speaker, she is a member of the Speakers Bureau for the Secular Student Alliance and the Center for Inquiry.
She was a speaker on the Diversity in Skepticism panel at The Amaz!ng Meeting in July, 2011, the Reason Rally in 2012, and the 50th annual convention of American Atheists in 2013.

Rebecca Hensler founded the social media and internet support group 'Grief Beyond Belief' for grieving people who do not believe in God or an afterlife in 2011; she was encouraged to found it by Christina.

In 2013 Christina was named the International Team Honored Hero of the Foundation Beyond Belief (FBB).
The Foundation's teams raise money for The Leukemia and Lymphoma Society.
As of 2015 she is a member of the Foundation Beyond Belief's Board of Directors.

She received the 2013 LGBT Humanist Pride Award from the American Humanist Association.

Also in 2013, a photo of Christina with her wife Ingrid and a piece about the photo by Christina was featured in the book A Better Life, by Christopher Johnson, which is a book with photos of 100 atheists and pieces by them about how their atheism has enabled them to have, in their view, a better life.

In 2015, Christina received the first Secular Student Alliance Ambassador Award, which was the 2015 Secular Student Alliance Ambassador Award.
Christina is an Advisory Board member of the SSA and a donor at the Lifetime Membership level.

Outside of her atheist work, she is the editor of Paying For It: A Guide by Sex Workers for Their Clients and of the Best Erotic Comic anthology series, and has written the erotic novella Bending and the erotic fiction collection Bending: Dirty Kinky Stories About Pain, Power, Religion, Unicorns, & More.
Her writing has also appeared in three volumes of Best American Erotica.
She has also written about cats for Catster, and has written for the magazine Femme Feminism.

She previously worked at Last Gasp and Lusty Lady, both in San Francisco.
She has also performed in pornography.
Christina is a regular atheist correspondent for AlterNet, Free Inquiry, and The Humanist, and has been writing about atheism in her own "Greta Christina's blog" since 2005. Her blog is now part of The Orbit, the "first atheist media site founded explicitly to work on all forms of social justice." In 2009, Hemant Mehta at the "Friendly Atheist" ranked Christina's blog in the Top Ten most popular atheist blogs. She also created the "Atheist Meme of the Day" on Facebook.
She has been writing professionally since 1989, and has been a full-time freelance writer and speaker since 2012. Her writing about atheism has appeared in print in Skeptical Inquirer and the anthology Everything You Know About God Is Wrong, as well as in her own books Coming Out Atheist: How to Do It, How to Help Each Other, and Why (2014) and Why Are You Atheists So Angry?: 99 Things that Piss Off the Godless (2012).
Speaking to Chris Mooney for a Point of Inquiry podcast in 2012, she stated that "there isn't one emotion" affecting atheists "but anger is one of the emotions that many of us have ...[it] drives others to participate in the movement". She feels that there are many goals for the atheist movement — more separation of church and state, ending "bigotry against atheism", and for some, persuading people "out of religion". She thinks it is a "valid goal" to work towards a world without religion.
As a speaker, she is a member of the Speakers Bureau for the Secular Student Alliance and the Center for Inquiry. She was a speaker on the Diversity in Skepticism panel at The Amaz!ng Meeting in July, 2011, the Reason Rally in 2012, and the 50th annual convention of American Atheists in 2013.
Rebecca Hensler founded the social media and internet support group 'Grief Beyond Belief' for grieving people who do not believe in God or an afterlife in 2011; she was encouraged to found it by Christina.
In 2013 Christina was named the International Team Honored Hero of the Foundation Beyond Belief (FBB). The Foundation's teams raise money for The Leukemia and Lymphoma Society. As of 2015 she is a member of the Foundation Beyond Belief's Board of Directors.
She received the 2013 LGBT Humanist Pride Award from the American Humanist Association.
Also in 2013, a photo of Christina with her wife Ingrid and a piece about the photo by Christina was featured in the book A Better Life, by Christopher Johnson, which is a book with photos of 100 atheists and pieces by them about how their atheism has enabled them to have, in their view, a better life.
In 2015, Christina received the first Secular Student Alliance Ambassador Award, which was the 2015 Secular Student Alliance Ambassador Award. Christina is an Advisory Board member of the SSA and a donor at the Lifetime Membership level.
Outside of her atheist work, she is the editor of Paying For It: A Guide by Sex Workers for Their Clients and of the Best Erotic Comic anthology series, and has written the erotic novella Bending and the erotic fiction collection Bending: Dirty Kinky Stories About Pain, Power, Religion, Unicorns, & More. Her writing has also appeared in three volumes of Best American Erotica. She has also written about cats for Catster, and has written for the magazine Femme Feminism.
She previously worked at Last Gasp and Lusty Lady, both in San Francisco. She has also performed in pornography.
Greta Christina