T.N.D. Mettinger denies that resurrection was rooted in mythological lore.
T. N. D. Mettinger, The Riddle of Resurrection: “Dying and Rising Gods” in the Ancient Near East (Stockholm: Almqvist and Wiksell, 2001), 221
There is, as far as I am aware, no prima facie evidence that the death and resurrection of Jesus is a mythological construct, drawing on the myths and rites of the dying and rising gods of the surrounding world. While studied with profit against the background of Jewish resurrection belief, the faith in the death and resurrection of Jesus retains its unique character in the history of religions. The riddle remains.