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- Sabbath
- Sabellianism
- Sahaja Yoga
- Sai Baba, Sathya
- Saint Death
- Saints Alive in Jesus
- Sacred Tribes Journal
- Salad-bar Religion
- Salafi
- Saliba, John
- Salomon, Gershon
- Salva Me Pater Omnis Oculos Meus
- Salvation
- Sam Hinn Ministries
- Samples, Kenneth
- Sanford, John and Paula
- Sangoma
- Sanskrit
- Santa Muerte
- Santeria
- SantÃsima Muerte
- Satanism
- Satanic Ritual Abuse
- Scepticism
- Scheidegger, Martin
- Schlessinger, Dr. Laura
- Schuller, Robert
- Science
- Science of Creative Intelligence
- Science of Identity Foundation
- Scientology
- Scientology, Books on
- Scism
- Scismatic
- Scott, Gene
- "Scripture Twisting Methods of the Cults"
- Seas of David
- Secret Sect
- Sect
- Sect Commissioner
- Sect Filter
- Sectarian
- Secticide, Le
- Seed-Faith
- Seeker-Sensitive Churches
- Self Empowerment Academy
- Self-Realization Fellowship
- Seok, John Myung [John Myung Seok]
- Servants of the Eucharistic Heart of Jesus
- Servetus, Michael
- Setsuri: See John Myung Seok
- Seven Seals, The
- Seventh-Day Adventism
- Sex
- Sex Magic
- Shaktipat
- Shakty Pat Guru Foundation
- Shamanism
- Shamblin, Gwen
- Share International
- Sharia
- Sharp’s Rule
- Sheep Stealing
- Shelton, Rick
- Shepherding
- Shepherd’s Rod
- Shermer, Michael
- Shi’a
- Shi’ittes
- Shinshuren
- Shouters, The
- Shunning
- Shupe, Anson
- Siddha Yoga Dham
- Signs and Wonders
- Sikhism
- Silent Aryan Warriors
- Silvania
- SIMPOS
- Sin
- Sinason, Valerie
- Singer, Margaret Taler
- Singh, Charan and Sawan
- Singh, Kirpal
- Six-Six-Six
- Skeptic Magazine
- Skeptic’s Dictionary
- Skeptical Inquirer, The
- Skepticism
- Skeptics Society
- Sky Kingdom
- Slain in the Spirit
- Slick, Matt
- Smith, Ed
- Smith, Huston
- Snake Handling
- Society for the Study of Metaphysical Religion
- Society of St Pius X
- Sociology 257: New Religious Movements
- Soka Gakkai International
- Solar Temple
- Solid Rock
- Solomon’s Temple
- Sons of Freedom
- Sons of Light, The
- Sons of Thunder
- Sound doctrine
- Southern Poverty Law Center
- Spiritism
- Spirits, Territorial
- Spiritual Abuse
- Spiritual Counterfeits Project
- Spiritual Gifts
- Spiritual Gifts and Manifestations (1 Corinthians 14)
- Spiritual Mapping
- Spiritual Warfare
- Spoken Word Publications
- Spriggs, Elbert Eugene
- Sproul, RC [RC Sproul]
- SRA
- Sri Aurobindo Association
- Stafford, Greg
- Stamm, Hugo
- Stand To Reason
- Statistics
- Steve Winter FAQ
- Stevens, John Robert
- Steward, Don
- Stockholm Syndrome
- Story, Carl E.
- Strategic Level Spiritual Warfare (SLSW)
- Stratford, Lauren
- Street Gangs
- Strong City
- Students of the Seven Seals
- "Subtle Power of Spiritual Abuse"
- Suborthodox
- Success Coach
- Success Seminars
- Sufism
- Suicide Bombers, Islamic
- Summum
- Sunderland Christian Center
- Sunni
- Superior Universal Alignment
- Supreme Mathematics
- Supreme Truth
- Sword Distributing
- Sword of the Lord
- Sword, Golden
- Sword of the Lord Ministries
- Syncretism
- Synoptic Problem
- Syzygy: Journal of Alternative Religion and Culture