In the central chapter of Can God Be Free?, William Rowe offers what amounts to an a priori argument for atheism. In what follows, I first clarify this argument, and I then defend it against recent criticisms due to William Hasker. Next, however, I outline four ways in which theists might plausibly reply to Rowe’s argument.
Kraay, Klaas J., "Theistic Replies to the A Priori Argument for Atheism" (2005). Philosophy Publications and Research. Paper 9.