He does not say, nor is it established that he or his family practice any Christian religion, but it is made clear in two different scenes that he is not Catholic, and given that his surname is English/Irish, it is assumed by the reader that he is not Jewish, either.
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No - they are not related.
Holden's younger sister.
Holden's sister Phobe, how is mad at him because Holden wouldn't take her with him when he headed west.
4. Holden, DB, Phoebe, and Allie.
Nothing major has happened to William Holden's oldest son Peter West Holden. In 2013, he appeared in an episode of the TV show Castle.