I think what a lot of people, especially abroad, fail to realize that the Nation of Islam is what most people are exposed to in the United States not mainstream Islam. As far as the teachings go, they seem to be equal to the worldwide teachings with a few exceptions.
Historically, the Nation of Islam was founded here during a time when the country outlawed slavery and had some serious segregation issues. It was a militant group that focused on Black (Afro-American today) pride and strength and helped create a lot of reform and unity in the United States among the Afro-Amercians. At that time, it preached hatred and shunning of any white people or even light-skinned interracial people, which was self-preservation then. But that seperatist attitude is still taught and enforced now. Elijah Mohammad (founder) is also seen as a prophet by this sect.
Among our society today, "jailhouse muslims" (a slur and reference to where most are recruited) are abundant. Jailhouse muslims are the ones that curse every other word, whose women move aside the veil to smoke their cigarettes (Saturday, my daughter was shocked as one flipped it over her head to drink orange juice on the subway), have seven kids trailing them from four different men, try to sell stolen merchandise at cut rate prices, and on and on.
Of course these are the muslims that stand out and are the ones that people remember. Just like a nun would if she was cursing or smoking.
My husband was born in Pakistan and has been a Muslim all his life. When he started working here in American and came in contact with most of these people, he was dismayed.
There is a big difference in the way he lives his life and his beliefs from the Americanized version most people here in America are exposed to. If you ask an American here about Muslims, most will bring up examples of Nation of Islam and assume that the rest of the world is the same.
I have met, gone to college with, worked with Nation of Islam people and there are a few great people that are close to me and my family. But unfortunately, there are those that wear the clothes and quote from scripture, but live as far from the techings as they can in attitude and in example.