Chaudhary and Zara are shown together and the show references middle-eastern and Indian in the same way.
In real life, India is an entirely separate country with no relation to the middle east (except invasions from the middle east).
Islam is a major point of contention in India due to the invasions and the legacy of Islamic conquest.
Furthermore, henna was used independently in India without Islam or middle-eastern influence and has its own name and tradition in traditional indian culture.
It is not a Muslim only thing. See more
[after it's revealed that Sean Webster murdered a Muslim prisoner while in jail
Your lawyer's gonna be pissed, Sean. You just convicted yourself.
One less Arab, one less terrorist.
Sean, seal your lips. Not another word. Actually, my client just proved my theory correct.
What? Another murder gets him off?
No, it gets him sent to a mental hospital for the treatment he so desperately needs.
An insanity defense? You've got no grounds.
Sure, I do. His genes. The motion will be filed tomorrow. Sean ...