Religion: Norse/Teutonic paganism
Name: The Mad Viking
Alter Ego: Josefsen
Other Names: The Viking
First Appearance: The Man-Thing (vol. 1) #16 (Apr. 1975): "Decay Meets the Mad Viking!"
Number of Appearances: 5
Note: contemporary man; went mad when forced to retire
The Mad Viking teamed up with Olivia Selby to raid a local high school and burn textbooks they deemed offensive. Selby wanted to burn books that taught ideas she regarded as dangerous and inappropriate for school children: Communism, atheism, and sex. The Mad Viking agreed and helped her. It's not clear that the Mad Viking actually subscribed to Norse/Teutonic paganism. If he did, he and Selby would certainly seem to be strange partners, as she is no doubt a fundamentalist Christian opposed to paganism as well. The Mad Viking simply strongly identified with his Viking ancestors, admiring their manliness and work ethic. Whether he was genuinely a Norse pagan or simply a self-identified Viking may be unanswerable.
Suggested links for further research about this character and the character's religious affiliation: