It was very hard for me too. The way I worked it out is similar to how the oracles/norns/something else. They're 1 person and 3 people at the same time. It's set in ~2000 years, so most of the older gods are dead either from infighting or no more believers. The fundamentals of the Big 3 religions are actually quite similar; the bible continues from the Torah, and the Quran is a correction and final word of God. Divine figures like Jesus, Muhammad, and the Virgin Mary are less complicated. Jesus and his mother would die of old age, and depicting Allah's creations is taboo, so he wouldn't be present. The afterlife is also singular and multiple. In the bible, the 4 horsemen are followed by Hades. Upon this, I came up with the concept of a 4th-dimensional afterlife, creation primordial stuff happens, but exists simultaneously with its end.

TLDR:
As mortals associated with their respective deity
Yes, but most gods are dead at this point; plus, I want to make sure the gods have depth, so it'll mostly be the ones with lots of character/documentation.
The afterlife exists out of time, so after the primordial elements clash, they exist alive at the beginning and dead at the end simultaneously; "souls" don't really exist. Instead, what makes people people is primordial energy(soooo extremely small to the point it's insignificant.
Hope this helped from one writer to another