The illustration is "Pope Urban preaching the first Crusade" from the book by Charles MacKay, 1841.
Religion, unlike skin colour, is a matter of choice, so criticism of others' religious beliefs is legitimate. The sites here go beyond that by substituting abuse for criticism or by being gratuitously offensive.
For the special case of religious idiocy called creationism, please click here.
The Millenium Bookshop has books about religion and its effects.
There are sites listed in this category.
Living Waters Down Under – Ray Comfort
Maharishi Ayurveda Products
Maharishi Mahesh Yogi
Mercy Seat Christian Church
Mission to Israel
Nation of Islam Online
Operation Save America – Rev Rusty Thomas
Order of Nine Angles
Personal Liberty Digest – Bob Livingston
Posse Comitatus, USA – James Wickstrom
Protocols of the Elders of Zion
Q Society of Australia
Reformation Harvest Fire Ministries – Danny Nalliah
The Rutherford Institute
Scriptures for America Worldwide
Sermons of Ian Paisley – Ian Paisley
Society for the Practical Establishment and Perpetuation of the TEN COMMANDMENTS
Society of St. Pius X
Trinity United Church of Christ
True Blue Healer
Truth Ministry / Hope For Wholeness