Single word for "in a holy way"

I was writing a satirical story, and wanted a single word to express the concept of "in a holy way" or "in a holy manner". For example, were it actually a word, a good example would be "holy-ly". For a specific instance in which it might be used:

So, the priest walked into a bar with a rabbi and a monk?

Yes, but he did it oh-so-[in a holy way], so everyone was overawed.

A compound word or phrase would be acceptable. However, I'm not a huge fans of neologisms, so nothing constructed please. I would strongly prefer an adverbial form, but would accept it if no such suitable word exists.

Solution 1:

As OP has presumably noticed, most words with the sense sought here only really exist as adjectives that don't naturally have associated adverbial forms (holy, hallowed, blest, venerated, sanctified, consecrated,...).

It doesn't necessarily connote theism / religion, but noting usages like His reverence the Reverend Green in Cluedo, the best I can come up with is...

reverently
showing great respect and admiration _{(Cambridge Dictionary)}

...where I think it's fair to say "reverently" and "in a holy way" are near-synonymous in OP's specific context.

Solution 2:

holily is a word. An adverb.

In a holy manner; with sanctity or devoutness. OED

1754 J. Edwards Careful Enq. Freedom of Will iv. vii. 236 To act holily and wisely in the highest possible Degree.

It's in the Bible, too, actually. King James Version:

1 Thessalonians 2:10 Ye are witnesses, and God also, how holily and justly and unblameably we behaved ourselves among you that believe: