[adherence](https://en.oxforddictionaries.com/definition/adherence) - noun 

1. attachment or commitment to a person, cause, or belief.


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[devotion](https://en.oxforddictionaries.com/definition/devotion) - noun  

1. Love, loyalty, or enthusiasm for a person or activity. 

2. Religious worship or observance. 


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[fellowship](https://en.oxforddictionaries.com/definition/fellowship) - noun

1. Friendly association, especially with people who share one's interests.


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See also: [association](https://en.oxforddictionaries.com/definition/association), [commitment](https://en.oxforddictionaries.com/definition/commitment), [affiliation](https://en.oxforddictionaries.com/definition/affiliation)