This identifies him as Muslim, but I don’t think this was sudden Jihadi syndrome, but someone with a specific axe to grind against his former professor.
https://www.everipedia.com/mainak-sarkar/
Let’s be frank: An Indian who sucks at engineering has little or no value in their society, and he knew it.
It says he is Hindu. Did you not read it?
Your link identified him as Hindu, not muslim.