The point is, nothing exists except energy. Therefore everything we see, and the likes of you people keep calling reality, is just an illusion.
Stuff is not stuff, it is energy in another form.
Not really. You misunderstand the nature of energy. It isn't a form of stuff, it's an
indirectly observed quantity, an equivalence relation. The best analogy I know is value (i.e. financial value). A block of gold, a wad of currency, a house, and 10 years work can all have the same value. You can convert a block of gold into a house of the same value either by direct exchange, or by using it to buy wood, bricks, mortar, and builder's time and having it built. But gold, bricks & mortar, builder's labour, and currency are
not made of value, they each
have a kind of value that can be converted into other kinds of value. Like most analogies, it's incomplete (for example financial value isn't conserved, it depends on human judgement) but it gives an idea of the principle.
Saying that matter can be converted to energy is a convenient shorthand for this equivalence relation. When matter is 'converted' to energy (e.g. nuclear explosion) it doesn't cease to exist, it is broken down into subatomic and elementary particles moving at velocities or having frequencies that, in total, have the equivalent energy value. The common idea of energy as light or radiant heat, consists of photons, and the higher the frequency of the photon, the greater its energy equivalent. But it's not made of energy, energy is a property it has.
So reality isn't an illusion, and stuff isn't made of energy. The real illusion (strictly delusion) is the spirit world.