Are those Illuminati conspiracy theories similar to the Masonic conspiracy theories?

First of all, the Masonic conspiracy theories are total BS. Anyone that tells you that Masonic organizations are evil or Satanic needs a reality check.

I saw the movie Angels and Demons with Tom Hanks, and there were references to the Illuminati. I’ve heard other stories that they were a secretive Satanic organization, but I don’t trust those stories at all.

Are the Illuminati conspiracy theories based on any fact at all? Who were (or are) they?

they are not based on fact at all.

the Bavarian Illuminati, to which every reference refers, was a group, a secret society, that wanted to bring about a new world order (they coined the phrase) through education and enlightenment, free from the dogmas and fanaticism of formal religions.

the lasted about 9 years and were disbanded 225 years ago.

amazing how they can last so long in the minds of naive people — of course can you blame them when there fiction writers (dan brown) and down right bad people – cutting edge, schnoebelen, etc… trying to make a profit off those naive people????