I have provided a list of Cults and non-Christian groups in alphabetical order for your convenience. There are many more out there and I’ll add names in here as time goes on. At least if you can find a group listed here, you’ll know it is non-Christian. Links provided will go to articles for you to learn more about the groups and also they are great resources for you while witnessing.

I’ll add links as time permits.

1. aarm  Atheist Apologetics and Research Ministry
2. Abortion
3. Atheism
4. A True Church
5. Adidam
6. Alcoholics Anonymous
7. Amish
8. Annihilationism
9. Apologetics Press
10. Assemblies of Yahweh
11. Baháʼí
12. Black Hebrew Israelites
13. Bible.ca Website
14. Buddhism
15. Christadelphianism
16. Christian Family Fellowship, The
17. Christian Identity Movement
18. Christian Reconstructionism, Theonomy
19. Christian Science
20. Chrislam
21. Church of Christ, International
22. Church of God in Wales
23. Conversations with God
24. Creation-Evolution
25. Eastern Lightning
26. Eckankar
27. Emerging Church Movement
28. Emotional Freedom Techniques
29. Government
30. Hebrew Israelites
31. Hinduism
32. Homosexuality
33. How to Have Perfect Faith
34. Hutterites
35. International Church of Christ
36. International House of Prayer – IHOP
37. Islam
38. Jehovah’s Witnesses
39. “John of God” in Brazil
40. Kabbalah
41. Kemetism
42. Kingdom of Jesus Christ
43. King James Onlyism
44. Eastern Lightning, Lightning of the East, from China 
45. Molinism
46. Mormonism
47. Nation of Islam
48. New Age Movement
49. New Apostolic Reformation
50. New Life Mission, the
51. Oneness Pentecostal
52. Open Theism
53. Orthodox Church
54. Philadelphia Church of God
55. Quakers
56. Raelians, The
57. Rastafari
58. Relativism
59. Restored Church of God
60. Roman Catholicism
61. Scientology
62. Shepherd’s Chapel
63. Slavery
64. Seventh-Day Adventism
65. Social Justice
66. Swedenborgianism
67. Third Day Church
68. Truthism.com
69. Unification Church
70. United Church of God
71. Unity School of Christianity
72. Universalism
73. Way International, The
74. Weigh Down Weight Loss founder Gwen Shamblin
75. Westboro Baptist Church
76. World Mission Society Church of God
77. The Worldwide Church of God