"spiritual devotion" is correct and usable in written English.
You can use it when you are discussing someone's strong and sincere commitment to their religious or spiritual beliefs. For example, "The woman's spiritual devotion was unshakable, and she never wavered in her faith."
Pilgrims (kalpwasi) gather to bathe twice daily in the Ganges and live a life of spiritual devotion.
Throughout, images of Buddhist ceremonies and rituals suggested an earthly cycle connected to the mysteries of time and transience through deep spiritual devotion.
Unfortunately, this year kosher meat has become a different type of symbol, one not of mourning and spiritual devotion but of ridicule, embarrassment and hypocrisy.
In the final act, where she had only one phrase to sing ("To serve"), her portrait of spiritual devotion remained at the center of the drama.
His early mastery of fresco is clearly visible in his St. Augustine (1480) in the Church of Ognissanti, in which the saint's cogent energy and vigour express both intellectual power and spiritual devotion.
The Risalo reflects Latif's profound engagement with the fundamental literature of Islam as well as his openness to varied local traditions, including notable poems praising the spiritual devotion of local Hindu yogis.
This devotion is sincere.
All this reverence for religious traditions bothers a few critics (parts of "Going Forth By Day," said the New York Times' Grace Glueck, brought to mind Bunuel's satire "Simon of the Desert"), and Viola himself sounds strangely cryptic when discussing his specific spiritual devotions.
Mr. Fonte suggested religious devotion and spiritual ecstasy through a series of fluid balletic duos and slow trancelike walks, one dancer almost always alone and in ambiguous relationship to the other two.
Cambodian dance began as a form of religious devotion, and those spiritual roots are very much on Ms. Shapiro's mind.
Founded in 1098 in reaction against the perceived loosening of the Benedictine rule, the Cistercian order (which took its name from the town of Cteaux) aimed to bring spiritual rigor back to religious devotion.
