No one died and came back to life, that is the silliest thing ever. It sounds more like a religious/government psyop to take power and brainwash over a group of people and it worked to this day.
Most of the ancient cultures have a death and resurrection myth of their deity. And then there’s this: The moon “incarnates” the light of the sun during the night. The moon “dies” at the end of its cycle, is unseen for three days, and then rises again as the New Moon. It’s a very old story, as human as you or I. But I think it’s good that you’re not letting the priest class control you.