Create index.md

Author: William Faircloth

topics/christianity/index.md

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+---
+display_name: Christianity
+logo: christianity.png
+related: religion, christian
+short_description: Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth.
+topic: christianity
+wikipedia_url: https://en.wikipedia.org/wiki/Christianity
+---
+Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth.