Ragnaros: The Grand Adventure
The Karn religion focuses on worship of the mother, Dr. Abadel. The main teachings of the KArn religion are to respect and honor humans since it was a human who created them. They worship Dr. Abadel since she was kind enough to give them life of their own.
Spriganoch tend to focus on the worship of nature itself. They see everything has life so everything is in fact holy. The holiest of them all though is the Great Tree. It is the largest and oldest living thing on the planet. The Spriganoch say that the tree itself holds memory and knowledge of thousands of lifetimes and only a select few are ever chosen to view this knowledge.
Lopetarves have a similar way of worship as the Karn do. They worship someone who was once living but are now long gone. His name was Thelius the Diamond Breaker. He was the first and mightiest Chieftain there was, said to be able to cleave an entire wall of pure diamond in two. He is worshiped and praised for his strength, and no Chieftain has yet to match his strength.