You've got this in the wrong order. It should be:
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1. If the supernatural existed, we could test it, theorise it, quantify it, etc.
---Quote---
1. If the supernatural existed, we could test it, theorise it, quantify it, etc.
(although, if 'religion' is defined as 'set of beliefs regarding things considered 'supernatural' and 'God', well, it becomes a religion...
)*

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