The phrase "a deep devotion to" is correct and usable in written English.
It can be used when expressing a strong commitment or loyalty to a person, cause, or belief.
Example: "Her deep devotion to her family is evident in everything she does."
Alternatives: "a profound commitment to" or "a strong allegiance to".
She also had a deep devotion to animals, volunteering at shelters as well as adopting stray dogs and cats.
With a kind heart, a generous spirit, and a deep devotion to family, Win lived a life of love, accomplishment, adventure, creativity and joy.
Despite the many differences displayed by the seven senators on the Watergate committee they share a deep devotion to find the truth.
But as an impassioned conservationist with a deep devotion to the English countryside, he dedicated his life, and his art, to nature and wildlife.
He had a deep devotion to the Medical Center and was passionate about his work in furthering the Medical Center's mission.
This approach to his movement — firmly accented yet unforced — and to his work, which he often describes as "post-African/Neo-HooDoo Modern dances," is tempered by a deep devotion to structure.
Well, I've never met anyone with a deeper devotion to cannabis than myself, and, you know, I'm very proud of my memory, and my ability to get verbally organized almost under any conditions.
For Tibetan exiles, the jersey is not merely a testament to their deep devotion to soccer.
Don't you think that kind of deep devotion to a bygone era and a show on its way out has earned him a guest role in Season Six?
Change ringing is an arcane realm, rich in jargon, traditions and deep devotion to an art that dates back to the early 17th century.
The main motivation is deep devotion to a political, social or religious cause.
