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Like most Freemasons, I am middle class. I just like to put on the Tux and do ballroom or cool esoteric stuff. Go to your local Lodge and ask! (Illuminati was disbanded by the German Royalty in the 1770's, Sorry)

what esoteric stuff do masons believe in?

Also, the building of King Solomon's Temple is included in most legends. Look at history here; 50% of Isaac Newton's works were figuring out the dimensions of the Temple. Vitruvius was a cool, classical type, masonic character too.

The immortality of the soul. Some part of man survives the grave. That's why the "emblems of death" are used. There's more, but that's integral to Ancient Craft Masonry.