Thanks for your insight guys. To those who said marriage is a christian thing, if so, why are we so concerned about imposing the Christian view of marriage onto society? I guess my point was, when you marry you don't marry Jesus you marry another human being with all their faults and marriage goes right back to Genesis and so it is more of a human thing than a Christian thing. There's no special rules in the bible about how to have a wedding, wedding rings etc, yet we do it, why? Because of society and tradition - again, a human thing.
Yet, despite marriage being a Christian thing, apparently marriage for life is not, with a divorce rate no better than the secular world.
I see a pre-nup as no difference to getting insurance for your car in case you have an accident, getting insurance for your home in case there's a fire, a pre-nup is like marriage insurance for if things don't go as planned. Young christian people get divorced, old christian people get divorced, it happens.
That said, I personally wouldnt try to get a pre-nup, probably for this reason:
"I would be very hurt if my fiance asked me for a pre-nup and would definitely reconsider the marriage."
It's not something we're used to in the West.