As for Hindu or Sikh temples, Most Khaleejis are adamant about having NO polytheists in the Arabian Peninsula. The problem is they can't wean themselves off of cheap Indian labor.

Sikhs are monotheists, but its a different kind of monotheism from the Abrahamics. They don't think non Sikhs are wrong or that they are inferior or will suffer in an afterlife simply because they are of a different religion. Its kind of like Bahaism - they believe that all religions are just different paths to the same God.
Many Hindus actually believe that the various Gods are just manifestations of different qualities and attributes the one overarching God known as Brahma, so you can say that Hindus believe in one God too.
Although having said that, I like polytheists precisely because they scare and perplex believing Muslims with their unashamed colourful iconography and manifold Godly representations.
They should just recruit from Bangladesh and Pakistan so they don't have a problem with that.
"we can smell traitors and country haters"
God is Love.
Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.