Science is constantly proved all the time. If we take something like any fiction, any holy book, and destroyed it, in a thousand years' time, that wouldn't come back just as it was. Whereas if we took every science book and every fact and destroyed them all, in a thousand years they'd all be back because all the same tests would be the same result.
At the end of the day, whether it was in a little church or Westminster Abbey didn't matter: it was me, as a brother, doing a reading for my sister and her husband at their wedding, and I wanted to do it right.