1. Religious Forums
The largest forum on the internet for discussing religions from around the world.
http://www.religiousforums.com/forum/  

2. Coffin Talk
Forum has 42,682 posts.
http://www.coffin-talk.net/  

3. Pagan
Pagan Forum is an open faith community, welcoming people of all walks of life, sharing different perspectives and world views, and engaging in education, compassion and understanding.
http://www.paganforum.com/forum.php  

4. Hashkafah.com
Forum has 1,582,314 posts.
http://www.hashkafah.com/  

5. Jehovahs Witness
The biggest, busiest JW community & support discussion forum for Jehovah's Witnesses, those interested in JW.Org beliefs or the Watchtower Bible & Tract Society
https://www.jehovahs-witness.com/  

6. SikhNet
SikhNet makes a person's spiritual journey relevant in the context of the modern world and the way people live now. For over 24 years SikhNet has served the millions and is the largest Sikh...
https://www.sikhnet.com/discussion/  

7. Jews for Jesus
Want to learn more about why Jews should believe Jesus is the Messiah? Click here to Live Chat with Jews for Jesus or write us a message.
http://forums.jewsforjesus.org/  

8. Gratefulness
http://my.gratefulness.org/  

9. www.dhammawheel.com
Buddhist forum for discussion of the Dhamma of Theravada Buddhism. Largest English-language Buddhism forum.
https://www.dhammawheel.com/