The Center for Inquiry, a humanist advocacy group, first made its intentions known in December.

Since announcing the Freethought Books Project, atheist authors have been donating books to the organization and publishers have been pitching in — all in an effort to balance the theological messages being delivered to inmates.

Members of the public, too, have purchased atheist books off an Amazon Wish List that was setup to promote the book initiative.

“The project offers donated books on atheism, humanism, science, and skepticism to prisoners who seek alternatives to the religious proselytizing and indoctrination that is often unavoidable within the prison system,” read a press release announcing the project. “It will also connect inmates with volunteer pen pals at CFI branches with whom they can connect and share ideas.”