World Religions Index 
Testimonies of conversion from various religions to Christianity, recommended links, and tables and articles comparing Christianity to other religions and philosophies.
http://wri.leaderu.com/Apologia 
Arguments about Mormonism, the Gospel of Barnabas, and Islam.
http://www.apologia.50megs.com/
The Trouble with the Elephant 
Explores whether all religions are equally valid.
http://www.ptm.org/98PT/SepOct/Elephant.htm
Biblical Christianity Explained 
Explains and defends Christianity for Muslims, atheists and agnostics, Eastern religions, and followers of modern philosophies.
http://www.biblicalchristianity.freeserve.co.uk/
Side of Truth 
Help for Apostolics and Oneness Pentecostals to learn the truth about the nature of God, salvation, and Christianity.
http://ernchez.tripod.com/index.html
Many Paths to One Goal? 
Investigates whether world religions are complementary and equally true, especially focusing on comparisons between Christianity and Eastern religions.
http://www.comparativereligion.com/
Holy, Holy, Holy is the Lord of Hosts 
Explanation of the beliefs of and answers to common arguments by Oneness Pentecostals, Jehovah's Witnesses, Islam, Latter-day Saints, Unitarian Universalists, the Jesus Seminar, and Atheism.
http://trisagionseraph.tripod.com/
King Messiah Project 
Articles and sound files of talks countering Judaism, Jehovah's Witnesses, Preterism and Islam.
http://www.kingmessiahproject.com/
In Christian Defense 
Arguments against atheism, evolution, non-Christian religions, Mormonism, Catholicism and the beliefs of Jehovah's Witnesses.
http://aaron_mp.tripod.com/
Scientology and Christianity Examined 
Examines the teachings of L. Ron Hubbard and refutes his claim that Scientology is compatible with mainstream religions.
http://www.sweenytod.com/cos/