Kriya yoga is a scientific technique.

The practice of this yoga annihilates all the unusual and unreasonable elemental propensities ever-present in the spiritual centers of the human body.

It awakens the kundalini, or Serpent Power, and restores the equilibrium. It enables one to dispel delusion and ignorance and discover the divinity within ones' own self.

Practice of kriya yoga simply opens an apparently sealed way to divinity that resides in the human body. 

Once you discover this reality, all outward mantras and worship become futile. 

The Kriya process quickens the realization of the formless in the form and frame of the body. 

Close personal contact with the guru makes the realization easier. 

*Excerpts from: "Kriya Yoga, The Scientific Process of Soul-Culture and the Essence of all Religions", by Swami Hariharananda Giri, Third Edition on 22 March, 1986.