@Jasper10,
A group who says anyone claiming to be Buddhist is a Buddhist.
Besides, Buddhist don't claim the world is an illusion. They say any claim of understanding the world is an illusion, a condition called Maya.
Like George Harrison once sang, "Beware of Maya"
Watch out now
Take care, beware of falling swingers
Dropping all around you
The pain that often mingles
In your fingertips
Beware of darkness
Watch out now
Take care, beware the thoughts that linger
Winding up inside your head
The hopelessness around you
In the dead of night
Beware of sadness
It can hit you
It can hurt you
Make you sore and what is more
That is not what you are here for
Watch out now
Take care, beware of soft shoe shufflers
Dancing down the sidewalks
As each unconscious sufferer
Wanders aimlessly
Beware of Maya
Watch out now
Take care, beware of greedy leaders
They'll take you where you should not go
While weeping Atlas Cedars
They just want to grow, grow and grow
Beware of darkness (beware of darkness)