One may know, love and serve God as the Master, Lover, Friend, Mother; or as the Higher Self; or as Humanity; or as the Self in all creatures.
If it be objected that this gives scope to Atheism, it must be remembered that Buddha also has been termed an Atheist. The average Hindu is right in his conception of religion as dharma, to live according to holy rule; but the holy rule is not a mass of fugitive and temporary customs, but this, to live for God in oneself and others and not for oneself only, to make the whole life a sadhana the object of which is to realise the Divine in the world by work, love and knowledge.
Ref: Early Cultural Writings