Publishers Weekly reviewed the book as "a detailed and even-handed examination of the social and political environment surrounding New Atheism". In
Choice Reviews, D. R. Boscaljon recommended the book to general readers and undergraduate students to "understand the shape of atheism and how it has changed", praising that it offers "an excellent analysis of tensions and differences within the atheist movement" more broadly than just New Atheism.
Library Journals Christian Graham praised it as "an intelligent and sensitive treatise of contemporary atheism", recommending its "well-researched investigation" to "curious readers of all kinds". Sullivan criticised "definitional vagueness" in LeDrew's distinction between New Atheism, secular humanism and libertarian rationalism, as he shows that they majorly overlap. Moreover, Sullivan believed that there was not a clear division between humanism and scientism, that LeDrew's characterisation of New Atheism as "ideology" contradicts his later findings, and that LeDrew's comparison to past atheist conflicts are simplified as "cycles never simply repeat". Nonetheless, he found it "an extremely valuable synthesis of existing scholarly work" and "a founding block for future analysis". Marcus Schulzke praised
The Evolution of Atheism for its "thoughtful sociological analysis and original data about grassroots activists". However, Schulzke reviewed that LeDrew's characterisation of New Atheism as "fundamentalist" is a "familiar" but flawed argument, contradicting LeDrew's later analysis of its increasing diversity; similarly, writing that it focuses on a male or middle-class vantage point clashes with his later description of its diversity. Schulzke wrote that the book insufficiently justified why conservatism is characteristic of the "heterogeneous" New Atheism rather than just some of its figures, and is "unsatisfying" in trying to "map the movement" onto a
left–right political spectrum. Tom Flynn, writing in
Free Inquiry, found LeDrew to be "insightful" on the topic of New Atheism and "thought-provoking" in his taxonomy of the modern atheist movement; however, he wrote that the book is "marred by significant historical, analytic, and conceptual errors". These include that LeDrew's definition of atheism—as active rejection of belief in God—would exclude Dawkins, that he is inconsistent on whether New Atheism is truly "new", and that he has poor knowledge of the history of atheism. Flynn summarised that the book has "undeniable strengths, but its many and serious flaws erode its value". David Hoelscher of
CounterPunch praised the book for its interviews, "non-technical" prose style, "excellent introduction" to the main figures of New Atheism and for "interesting and relevant evidence" that the movement is conservative on gender issues. He approved that LeDrew "demolishes" the "myth" among atheists that "the belief that atheism is simply a matter of not believing in any gods". However, Hoelscher identified a number of limitations: LeDrew's "crediting of the social sciences with the predominant role in the development of humanistic atheism"; his lack of coverage of racism or of "the
Islamophobic New Atheist comedian Bill Maher"; and insufficient mention of "economic injustice" as it relates to atheism, such as to anti-capitalist atheists. ==References==