[BnDamo]

No you do not have to have a funeral, David Bowie didn’t .
There’s an interesting article about it here bbc/news/magazine-35812014

As an atheist I feel similar to you Jan. However, I did attend a humanist (non religious) funeral a few years ago. It was held at the local crematorium but was more of a celebratory type gathering and I found it much more comforting that the “typical” religious service.