The name Illuminati was given to a group of individuals who were seeking illumination or enlightenment behind closed doors. The name stuck, and evolved into the name that's coined to this group who is seeking to control the world and create this new world order. Some say freemasons are atheists. That is not true, since it is a requirement that one must believe in a supreme being to become a mason. Not all freemasons are Illuminati, but many Illuminati are masons. After they were captured and punished for their satanic rituals and beliefs, the "Illumanit" as it existed 200+ years ago was destroyed. Those who escaped persecution needed a place to regroup and maintain moving their agenda forward. The freemasons, already being a secret order, became their target, and they began merging with them. Today, you can't tell where freemason ends the Illuminati begins.
The reason for many secret societies throughout history is gnosis meaning knowledge. They keep, and protect, at the risk of harm or death to themselves, sacred knowledge. Some of this knowledge, it's said the average man, who has not proven himself to be wise and of integrity cannot be given or indoctrinated into holding sacred knowledge. The difference between "real masons' and as a 33rd degree mason states, "Those who call themselves masons, but are not." is the intent by what they do with this knowledge. This knowledge has been passed down in secret and only given to those who prove themselves to be worthy of having it. During ancient times, this was only given to those initiated into mystery religions. However, the Illuminati end of secret societies use his to control humanity, and to bring in this one world government.
When we look at the Illuminati though. How did they, without being part of a "secret society" already have access to this knowledge. If you research who the actual Illuminati families are, and their lineage you'll find their families have been here for thousands upon thousands of years. Their knowledge then, we can state is a family secret. You will also find within their families, the biblical anti-Christ. Everything that is going on in the middle east now is purposed to clear the path for their God to take his throne and be the ruler over this one world government. These families (in biblical history) are called serpent seed, sons of god aka decedents of the Nephillim. This one world government is only a continuation of what even history books state form the white man taking land from Indians, "to manifest destiny." They feel it is their divine right, because related to the gods, to control man, and thus far are doing a good job at it. Well these sons of god who are here now, 13 families, they are the Illuminati.