In response to the popularity of the Enneagram in evangelicalism, Marcia Montenegro explains the New Age origins of the Enneagram and how it has infiltrated the church through Richard Rohr.

Marcia's work can be found at Christian Answers for the New Age:
http://www.christiananswersforthenewage.org/

Richard Rohr and the Enneagram Secret:
https://www.amazon.com/Richard-Rohr-Enneagram-Secret-Veinot-ebook/dp/B085WCC3SC