The Hertz Chumash was the standard for, what is called in England, ‘Englisher’ shuls or United Synagogues, at least until many changed to Artscroll. But it is definitely and firmly Orthodox. It is used all over the UK and the Commonwealth, and it seems from what you are saying in former Crown possessions (ie the USA) too.
It’s difficult to know what is troubling you about mention of Christianity, without some context.