You mentioned that they are from Gujarat and are wearing U shaped tilak. I assume they are following Swaminaryan Sect of Hinduism. You can find more info on this here https://www.baps.org/

For Hinduism you can start by reading publications of Gita Press https://www.gitapress.org/

Hope this helps.

Why all I can think of now, is Terminator T-1000.

Great, more Gweilo data to collect and process for the Chinese Communist Party.

I was writing the tutorial in markdown for bash scripting. Somehow the format got messed up. Will fix the format when I can.