https://www.humanreligions.info/tags/defining_religion.html
Human Truth Foundation pages (8):
What is Religion? How Do You Define Religion?, in the following sections:
Fundamentalism and Literalism in World Religions, in the following sections:
Religious Extremism: 1.1.1. Religious Beliefs and Fundamentalism
Christian Extremism, Intolerance and Resurgent Fundamentalism: 1. Fundamentalism in World Religions
Islamic Violent Fundamentalism and Extremism: 1. Fundamentalism in World Religions
What is Religious Fundamentalism?
Dictionary List of Different Types of Religion
Time to Move On: Religion Has Cost Too Much: 1.2. Fundamentalism and Literalism in World Religions