The Flower of Death by Jessica Nahas

Many ages ago, the Gods ruled over the mortal lands with an iron fist. Numerous realms suffered under their cruel leadership, until all at once, the immortals vanished. The people of Calibria aren’t sure what happened to the horrid rulers all those years ago. They only know that now, the mortals worship a new religion and all aspects of Gods have been deemed forbidden by punishment of death.

Yet, every full moon, a stubborn young girl is found in a forgotten decrepit temple, worshipping a forbidden God. She prays to the Celestial to heal her dying mother.
Until one night, she is caught.