Hansikka your apprehension underpins some substance as Hindus are not considered "People of the Book" in Islamic parlance unlike Christians or Jews who carry a common semitic heritage with Muslims. I think as Qatar is a part of Arabian peninsula, and there are no Arab Hindus this indifference happens. However there is no reason why there should not be a Hindu temple, especially if Buddhists have. I think there are already temples in Dubai and Oman, so Qatar may have one too.