The existence of God

[Mister Agenda]

They believe unconsciousness first then consciousness next, and brain organ before mind in clear violation of the principle of causality* and abductive reasoning (Inference to the best explanation).
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* Cause proceeds effect, and the cause is always (yes always) greater than the effect.

Like when you need a bigger explosion to trigger a nuclear explosion...oh wait, you use a smaller explosion to trigger the really big explosion. There's a pretty long list of small causes that have much greater effects. Catalysts come to mind. So does a thought that leads to a plan that leads to construction of a building.

Edit: Ninja'd by Polymath, sorry.