Which is the correct word?

I find your persistence, both here and on other sites, admirable in that you will continue to post the same question until you get the answer you require.

I'd scrap the sentence almost entirely given the cliche "utmost energy and devotion" and the obvious problem with the way it reads, whichever of the two words are used.

Let's exert our utmost energy and devotion to sharing the XYZ religion's teaching.

We must focus all our energy and devotion towards sharing Nichiren Daishonin Buddhism's tenets.

For a modest MYR stipend I could be available here day and night with the usual tithe payable to the A2K coffers.