This is a quick post about the definition of “friendly atheist.”
Purdue University Emeritus Professor of Philosophy William Rowe famously coined the terms, “friendly atheist,” “indifferent atheist,” and “unfriendly atheist.” What did he mean by these terms?
unfriendly atheist: an atheist who believes no one is justified in believing that the theistic God exists
indifferent atheist: an atheist who holds no belief concerning whether any theist is or is not rationally justified in believing that the theistic God exists
friendly atheist: an atheist who believes that some theists are rationally justified in believing the theistic God exists
 William L. Rowe, “The Problem of Evil and Some Varieties of Atheism” American Philosophical Quarterly 16 (1979), 335-341.