Is atheism a valid philosophical stance to take, from an academic point of view?

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Is atheism a valid philosophical stance to take, from an academic point of view? I've recently been collecting university-published books, including on the topics of religion and philosophy and I noticed a pattern that there were far more books and university fellows dedicated to christianity and other forms of theism. Does this mean atheism is merely a curiosity in academics or have I been buying the wrong books?