Help me deconstruct this!

Palmyrene deities: from left to right: the lun...

A letter from Autumn

This would probably be better posted in the forums but, I know there are some brilliant minds on here that could help me work though this puzzle. My in-laws are challenging my husband on his lack of belief, and I struggle to understand what they're saying, let alone where they're coming from, and therefore I cannot deconstruct what they are trying to argue. They've started discussing it on his Facebook (great idea, since most of our friends don't know about his lack of belief) and I don't really have a lot of time before all our other religious friends (we attended a bible college) jump in and make a huge mess of things.

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