Are you sure you want to change the default, or do you just want to have an easy way to apply the correct formatting once that you know is right?
I'd suggest you create a "Litgurgical" style and save it in the Normal.dotm file. That way it will be imported into any document you create. It won't be the default, but you can click on it in the style selector on your Home tab, and you know it will be set up correctly.
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