If you date a Muslim without converting expect problems, big problems. A lot of Pakistanis round here, and I suspect they have the same attitude in other parts of the West, consider White girls to be 'easy' and not wife material. They will have a 'White slag' on the side and then the approved of girl will be their wife. I know a Muslim who was arrested and charged with the murder of his daughter, she disappeared after she was found to be dating an inappropriate person. The charges were dropped but the girl didn't surface. I don't know whether this kind of thing is just common among Pakistanis or whether it is a Muslim thing in general. Sikhs and Hindus probably wouldn't be nearly so difficult to gain acceptance among without converting.
I've heard/read a lot about the 'marriage crisis' in the UAE, because the local men tend to marry foreign women (more usually Arabs though, from the Levant generally) and the government now even 'sponsors' mass marriages into their own community: Always found the Emirati men somehow 'cultured' or 'sophisticated' (you know, a lot into poetry, arts and snobby stuff ), I guess it influences their views on marriages with white women, but don't think that it goes for all peoples in the Middle-East, it's pretty vast and encompasses a lot of different groups and mentalities (an Assyrian will act differently than a Yemeni, for instance)... though I can speak for Indians, and South Asians as a whole, and I think that the post #4 works well.