Preaching at the funeral of someone who was almost surely an unbeliever is very difficult. This article offers a few things worth considering if you are given such an opportunity: talk about the fall, death, and judgment, exalt Christ, hold out the hope of the resurrection, emphasize the role of faith, and stay away from eulogizing.
Have you ever as a pastor led a funeral service of an unbeliever? Should pastors do that? This article shares some insights on leading such a service.
What do you want people to say about you at your funeral? Maybe it is also worthwhile to say what you do not want people to say at your funeral. This article explores the latter.