Yagya is to refine our nature and lifting it towards the Divine through the fire of Godward aspiration.
Puja is to adoration and surrender to the Divine which opens and brings the human consciousness in contact with the Divine.
Mantra is the sound or words that represent the Divine and connect us with higher states of consciousness. They arise within the heart or descend from above the mind in response to our aspiration.
Shradh etc are to help the departed when they are moving through the dark vital worlds.
These activities belong primarily to the religous mind and that phase of human development. No true spiritual path engages in them.
We do not do these things here because the aim is not religous but spiritual.
Affectionately,
Alok Da
