Basically it would be cherry picking the bits of Christianity which suit them and - surprise surprise - that obviously wouldn't involve anything which stops them doing exactly what they want to do, whenever they want to do it, including upsetting vast numbers of people, simply because they want to, not because it has any impact on their life, or stops them having children, or having their relationship legally recognised, or even recognised by a religious institution, or having a family life, or anything. Simply because they want to and they can, and as MrsDV so rightly points out, because they've got the money to do it. Quite frankly if they're so enamoured of gay rights there are plenty better ways to spend the money to improve the rights of gay people round the world. But they wouldn't get quite so much attention or upset so many middle-stump people. They could upset some intolerant people who would get genuinely angry and be genuinely troublesome to this couple, but there's no way they'd do that. Too much trouble in return for too little attention.