Name: Ram Singh
First Appearance: The Spider
Number of Appearances: 120
TV, Film Appearances: 2
Prose/Text Book/Story Appearances: 118
Ally: The Spider
Note: assistant of the Spider
Ram Singh was a major supporting character in The Spider pulp novels. He was originally explicitly identified as a Hindu, but before long the author of the series changed him to a Sikh.
There was apparently never any sort of "religious conversion" written about. The writer simply decided to stop portraying Ram Singh as a peaceful Hindu and begin portraying the character as an adherent of religion that was (in his mind) more violent: Sikhism.
Suggested links for further research about this character and the character's religious affiliation: