Assuming you've converted all the heathens, there's not really anything much you can do. You can't force villagers to "honor the statue" thereby gaining skills. They will only do it on their own, when they feel like it. All you can do is check the devotion box and hope they will improve. Those that have the most skill could be chosen
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to be rejuvenated in the hope that they gain more skills over several lifetimes.

I've had the most success using the nursery. I use the retired chief as a teacher, plus others who have high devotion skills (as well as the others). Kids generally "graduate" with at least adept-level skills all round and, of course, often greater skills if they've been rejuvenated.

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To err is human; to arr is pirate.