Here are two (very brief) articles by Russell D. Moore from Southern Seminary answering two questions:
Should a Minister Officiate at the Weddings of Unbelievers?
(His answer: No; My answer: No)
Should a Minister Preach at the Funerals of Unbelievers?
(His answer: Yes; My answer: Yes)
For those of you who are not pastors, I post these so that you can see a pastor’s reasoning for these questions. Contrary to what our church members often think, we do actually have reasons for why we do what we do.