I remember one of the first knock punches I landed in a argument I had with a “spiritualist”.  (Quite frankly I’m not sure what he believed, but it wasn’t of this world.)

“If there is no supernatural world”, he said, “how do you explain things like love?”

“Oxytocin.”, I replied.

One of the keys, I think, to defending atheism and skepticism is to read into the amazing research done in the exploding discipline of neurology.  It can be used without much effort to knock down the arguments like the “good Samaritan”.

Here’s just a taste of some of the things that beleivers constantly attribute to a god:

Altruism: Caused by the vegus nerve

Love:  Caused by the oxytocin and vasopressin.

Empathy:  Created by mirror neurons.