Looking fer precedent here. Found an interesting NYT article on the subject.
www.nytimes.com
Here's a case where a mother who converted to a born again form of xianity who then lost custody of her child to her atheist-ex after he and members of her own family complained.
From the age of 1 month, Mrs. Snider's daughter had lived with her, and later Mrs. Snider's new husband, Brian Snider, with occasional visits to her biological father.
But in 2003, when Libby was 6, an Alabama court gave primary custody to her father, William Mashburn, after he and Mrs. Snider's own family argued that the strict religious upbringing Libby received at her mother's home, which involved modest dress, teachings about sin and salvation, and limited exposure to popular culture, was damaging her.
There's also a story there about a guy who retained custody of his 12 yo kid, converted to Judaism and wanted to get the kid circumsized.
There's another one where a mormon was allowed by the SCOTUS to inform his 14 yo daughter about polygamy being a central tenet of his faith.
Ew, just ew.
In Spud's view it would prolly be better fer kids resulting from inter-faith marriages to be brought up being exposed to both parents religions and then let them choose fer themselves either the God behind Door number 1 or 2 or to reject both and become an atheist, agnostic, pantheist or wotever.
Bottom line on this story is that it seems pretty clear that this father is more concerned with punishing his ex-wife than he is with sharing his faith with his daughter.
There's no hate like hate that started out as love.
Sad is that.
Be Well.