"They that give God a new tongue shall feel His old hand."
- Thomas Adams
"I am not permitted to let my love be so merciful as to tolerate and endure false doctrine. When faith and doctrine are concerned and endangered, neither love nor patience are in order...when these are concerned, neither toleration nor mercy are in order, but only anger, dispute, and destruction - to be sure, only with the Word of God as our weapon."
- Martin Luther
- Handbook of Today's Religions
Josh McDowell & Don Stewart - A fairly exhaustive resource explaining how other world religions, cults, age groups, agnoticism, secularism, humanism, sects, etc. differ from biblical Christianity.
- The New Testament Definition of Heresy
Craig Blomberg - or When Do Jesus and the Apostles Really Get Mad? - Tolerance, Truth-Telling, Violence and Law
John Piper - Principles for How Christians Should Relate to Those of Other Faiths - Historic Heresies
Christian Apologetics and Research Minstry - Virtual Religion Index
Excellent academic site dedicated to major religions and cults. - Cults
Paul Seiler - A Biblical Guide To Orthodoxy And Heresy
Robert M. Bowman - Thinking Biblically About the World’s Religions
Kenneth Richard Sample - The Biblical Basis of Christian Apologetics and Counter-Cult Ministry
James White - “Would Jesus have done that?” A Biblical Look at Defending the Faith - Christ’s Warning Concerning False Teachers
Brian Schwertley - What Makes a Church or Group Non-Christian?
Matt Slick - So, Are You a Heretic?
Find out here whether you are 100% Chalcedon compliant - A Short Look at Six World Religions
Sue Bohlin - An overview of Islam, Hinduism, Buddhism, Judaism, Mormonism and Jehovah's Witnesses from a Christian perspective. - A Diagnosis
Thomas Adams - The Church of Oprah Exposed (YouTube)
Oprah - A Look at “The Shack” (MP3)
Al Mohler - The New Spirituality: Dismantling and Reconstructing Reality
Peter R. Jones
Monergism Copyright © 2007 by John W. Hendryx. All rights reserved
Audio and Multimedia (52 links)
Heresies: Heresy and Orthodoxy in the History of the Church 
Christianity And Its Competitors 
Defence of the Truth