Why do Jews have long lasting marriages?

Because they have been forced together via society's hatred, and jews are also from asia which is more communal anyways then individualistic British culture.

Many members of the jewish community who don't believe in God seem to view marriage as a sacred binding lifelong commitment with an extremely negative perception of divorce.

Can confirm this. My mum, one of the most secular people you'll meet, was still delighted my bf was Jewish as "oh, he'll take it seriously and you'll have a nice stable relationship!"

Divorce is pretty well accepted in Judaism, afaik, although there is still some social stigma (often depending on the reason for divorce). It's treated as a breach of contract, and there's often a lot of pressure to not divorce if there hasn't been that clear breach (ie no domestic abuse, no affair etc).

I've noticed that in a lot of divorce cases amongst the staunch religious traditionalists of Judaism, the priority at adr and with mediation that involves faith leaders in England seems to be to avoid divorce at all costs- even where admissions of adultery or serious violence are involved.
Three of my female coworkers are karaites with ancestors from Egypt and Iraq, no family history of divorce and all they seem absolutely terrified of being the first.

Almost identical situation with a lot of catholics, religious asian women of all religions and almost all fundamentalist christians.
My friend is a single fundamentalist christian in her mid 20s who believes in quiverfull and openly admits she would rather be dead than divorced or a widowed single parent. Even if the spouse was in prison for serious violence or had children as a result of an extramarital affair.