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The World Christian Database and the World Christian Encyclopedia are world-renowned for their content quality and comprehensive view on religious statistics.

Here are a few quotations:

The World Christian Encyclopedia leaves no stone unturned when it comes to the current state of Christianity in the world…Why add this to your reference collection? Simply put, it is the best statistical work on the current state of Christianity to come along in the 20 years since the World Christian Encyclopedia was first published… Students and faculty alike will be able to answer many factual questions related to Christianity and missions. But the sheer amount of information compiled will also lend itself to individual analysis of what is happening in the world today. The World Christian Database is a 'must have' for every library.

- The American Theological Library Association (ATLA)

The World Christian Encyclopedia combines remarkably well scientific objectivity and tolerance with a quiet evangelical faith...the authors have served modern social science and religious believers equally well with this magisterial work.

- James Billington, Librarian of Congress