Certainty and Faith
Fundamentally this means to me that all the mysteries of the universe, including the nature and substance of consciousness, are "solved problems". There are just the details to work out...
It is hard, although probably not impossible, to formalise a scientific method for spirituality. What I'm mainly suggesting is the approach to life, in all aspects of life which is the fundamental essence of spirituality anyway.
It is hard to formalise because the teaching of Jesus is that all the interesting aspects of spirituality happen only with extraordinary love.