Modern Kadampa Buddhism is a special presentation of Buddha's teachings for the modern world.
It is open to everyone whether Buddhist or not regardless of nationality, age or gender.
The meaning of the union of great bliss and emptiness is that through the force of meditation one's own mind of great bliss and emptiness become non-dual, just one, like two spaces mixed with each other. This is extremely profound and subtle, and these days those who understand the meaning of this union through experience are as rare as stars appearing during the day.
The Oral Instructions of Mahamudra