So when and under what conditions do the gods finally cease to exist?
When they die. Was that really such a difficult question that you could not work out the answer for yourself?
And if there is no soul in Buddhism, how do you get reincarnated?
Remember Heraclitus: “You can never step in the same river twice; the river is not the same river and you are not the same you.” There are five components to a human being: material form, feelings, perceptions, formations and consciousness. Only the formations part carries over from one life to the next – it carries memories of previous lives and accumulated karma. The other four all develop anew. If you are reborn as an eagle, then your sight perception will be greatly improved over human sight perception.
That is, how does the body get reanimated in some other form?
It does not. You will start as a zygote and develop a new body in the usual way.
Did the Buddha become a god?
He may have been a god in one of his previous lives, but he was not a god in his last life; he was a Bodhisattva, then a Buddha once he attained enlightenment.
Some people worship him as if he were a god. That is probably an error, and something he tried to discourage when he was alive. Given the way humans treat famous people, it was probably inevitable though.
Does the Buddha no longer exist?
• It is not correct to say that the Buddha currently exists.
• It is not correct to say that the Buddha currently does not exist.
• It is not correct to say that the Buddha currently both exists and does not exist.
• It is not correct to say that the Buddha currently neither exists nor does not exist.
Your question is one of the fourteen unanswerable questions and is effectively asking for a description of nirvana. If you want to know what nirvana is like, then become enlightened and see for yourself.
Abrahamic assumptions are relevant because they explain more than Buddhism does.
Abrahamic assumptions do not explain the path nirvana, hence they fall short.
For example, does Buddhism explain how or why the universe and humans were created?
The Buddha was asked that very question, and answered with a parable:
[The Buddha said:] 'It is as if, Malunkyaputta, a man is shot with an arrow thickly smeared with poison, … and the wounded man were to say “I will not have the arrow taken out until I know the caste of the man who shot it, … his tribe … his clan … his village … his height etc.” [many questions omitted here] That man would die Malunkyaputta, before he learned all that he wanted to know.
'In exactly the same way, Malunkyaputta, any one who says “I will not lead the religious life under the Blessed One until the Blessed One explains to me whether the universe is eternal, whether the universe is not eternal, whether the universe is finite, whether the universe is infinite etc.” [many questions omitted here] That person would die Malunkyaputta, before I had ever explained all this to that person.
‘The religious life, Malunkyaputta, does not depend on the dogma that the universe is eternal, nor does it depend on the dogma that the universe is not eternal etc. [many dogmas omitted here] Whatever dogma obtains there is still birth, old age, death, sorrow, lamentation, misery, grief and despair, of which I declare the extinction in the present life.’
– Cula-Malunkyovada sutta, Majjhima Nikaya 63
The universe exists, and we are suffering in it. Our first priority is to escape that suffering.
Your question is a distraction because it does not pertain to the cessation of suffering. Buddhism is a very practical religion; it is not interested in how many Kinnaras can dance on a pinhead.
Please quote passages from Buddhist sacred writings that explain how or why?
I have quoted the relevant passage, but I doubt that you will like the Buddha’s answer. What did Jesus have for breakfast, if anything, five days after His tenth birthday? It is very easy to formulate an irrelevant question and demand an answer.
rossum