So Basically they are people who believed in science more than religion and they are NOT satanic. There are some conspiracy theories about their association with Masons and the US government, but these are merely CONSPIRACY THEORIES and not proven facts so don't go around saying that they killed Michael Jackson or that they are singers that sold their soul to Satan. They are simply people who believe in science; the common day belief that is spread around (especially between teenagers) is completely absurd and has no facts behind it.
For more information about the Illuminati research using reliable resources or if you are too lazy just read Dan Brown's "Angels and Demons."
This pure definition make sense? Na, because nobody who would post information about a secret group would actually KNOW about it's beliefs/aims they would only be able to assume, as they would be a non-member (assuming the Illuminati does exist).
There's a reason they call it a theory.
A sect of 16th-century Spanish heretics who claimed special religious enlightenment
A Bavarian secret society founded in 1776, organized like the Freemasons
2) I was so Illuminati yesterday, never again."