In the NT Jesus makes it sound like he's the sun.
Indeed he does Acluetofindtheuser!
I see the that the whole Christ story as a vastly elaborated myth which ultimately has at its root an astronomical reality.
It is hard to appreciate this if coming to the subject cold. Much groundwork is needed including a comprehensive grasp of mythology (which I don't have) to be able to trace the individual threads of myth back towards the folk tales many of which are drawn from the zodiacal star stories.
The earth turns in a daily motion and the stars predictably change position on the annual orbit of earth around the sun. Knowing the constellations and stars, and their explanation was a "Bible" before the Bible.
In its simplest form back in pre-literate, pre-scientific times, an explanation was demanded of why things are like they are.Humans are like this. Stories feed on human imagination but for any to endure they must have a have a reference point and structure, this is the difference between stories and myth.
Nothing exists so patently structured and orderly and permanent as the starry canopy, so marvellous and universally recognised that it was branded the home of the gods. This gave the whole world of humanity a common canvas to paint their own cultural mythologies on and is the explanation of why disparate peoples came up with the same ideas about gods, religion and salvation.
I won't rabbit on-- but the universal saviour is the Sun God who daily overturns darkness, however his father is a Sun God as well, which is why there is a troublesome ambiguity in the Bible regarding the identity of the Son and the Father.
Three days dead? I asked myself the same question about six years ago. Well the sun 'dies' in the sense that for three days every year, as it was said to do on 21st December and rose again on the 25th. Which day we know is the birthday of the Sun, and from the fourth century onward, the birthday of Jesus who was conflated with the Sun God in the Catholic faith. (Sol Invictus, the unconquerable Sun) The death of the literal sun was describing the position of the sun's setting and rising as having stopped dead for three days and not moving along the horizon as it normally does for the rest of the year. The idea of "three days dead" based on this perception had already well before the first century become a signifier or accoutrement for a god-man hero in folk tales and heroic literature.
The Christ figure was simply one of many heroic christ myths who all shared the common tropes of solar connotation, sacrificial death, miraculous healing abilities, overcoming death etc. and including going to hell or Hades for three days.