My Dad was also a non-believer, and a man of very few words.  He lived independently until the end, and passed away 3 months shy of his 100th birthday (I think he did it on purpose to avoid "all the fuss").  When I asked him a few years previously what he wanted at his funeral, he replied in his usual laconic fashion: "Well, when the undertaker is finished with me, everyone should go have a party".  We did, and we had a great time.