The nun with a gun piques my interest in a specific way because it weds perfect naivety with absolute Death. Here she is clearly a fully eroticized bride of Christ who alone stands as a fetish symbol. The gun is of course a phallic extension so in short she is allowed to caress a facsimile of the very thing she has avowed to avoid.
I really like this. It's like she's asserting her independence through the shedding of old habits. She retains some form of her spirituality, though she is now poised to be her own woman unrestrained from religious dogma.