The best medieval philosophers in Western Europe held that human reason is unable to resolve whether the universe is eternal or had a beginning. This seems to be the case regardless of the latest findings about the process of early expansion of the universe. A singularity at the origin of expansion could have been eternal. We may have common ground regarding these points about the universe. Is the question of the possible eternity of the universe different from existence of the universe?
No, it does not cease to exist. You had considered yourself as a drop of water but you forgot that you are but part of the ocean. What constitutes me now was a part of universe, it now is, and will continue to be a part of the universe even after I am no more alive. People place too much emphasis on individuality, much beyond its worth, ego. The universe is because I am.
Is the universe one of the infinite number of bubbles that keep on rising and disappearing every Planck's moment?
God doesn't have a beginning or end. So he wasn't created. Has has ever existed and will ever exist. It is only normal if we can't fathom our Creator. Us understanding God would be the same as a table trying to understand the carpenter.
I suppose the answer to this question lies in what one considers to be "God." As I understanding it, man created anthropomorphic deities to understand divinity. The supreme divine, which I refer to as Nirguna Brahman, but what mystics of many religions, Abrahamic and Dharmic alike, are content to refer to as "God," is eternal. It has no beginning and no end. It is beyond time, space, and causation. Therefore, there was no entity that created it.
Or perhaps it is existence and non-existence. One moment, there is. The other moment, there is not. Not something that we understand today. It is a quantum world.
The physical universe may cycle in and out of existence, but I think the underlying existence is always there. Does the screen not exist in the absence of a movie being projected onto it?
It may be more than that for all we know. The screen disappears once the film is over. Possibilities. QM is not easy to understand. There is no screen in a hologram. Existence playing hide-and-seek.