The doll is provided with electrically conductive nails which when inserted through apertures in the hands of the doll, mount the doll to a provided cross and close an electrical circuit which illuminates the cross.
Cool. I’ll go one better. Let’s add another circuit in the side of the doll, with a little spear…and when you pierce his side, his eyes blink and his head spins around and pops off. It would be only slightly more tacky.