In their deepest core everyone without exception is the child of God. This child of God present in everyone is the soul within which is a portion of the Divine. The mixture is in the outer nature and this too is in everyone and remains so long as we do not turn within and seek our soul. When people live on the surface spending their life in selfish pursuits, which is the case with most, then they are more like an Asura. Sometimes they become a full blown Asura when this egoistic selfishness becomes extreme with a will to dominate others and possess and use everything for their own selfish purposes. It is this extreme ambition that is the hallmark of the Asura.
Affectionately,
Alok Da