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There is biblical precedence for letting God's light shine.
Matthew 5:16 Jesus specifically states that we are to let God's light shine to everyone. He likens it to a lamp's light stifled under a bowl. Allow the light to shine. An aura? Why not?
God's light can take many forms and I, for one, would never limit how that light is seen or experienced. God's light could be in a beautiful aura emanating from one of His flock or a kind deed done for someone in need.