Vladdo,
You’re either terribly lost, terribly ill-informed or terribly obtuse.
Why is the universe being eternal or popping out of nothing suddenly superior to the idea of an origin?
No-one says that it’s necessarily “superior”, but these and other conjectures mean you cannot just assume that a "something"
must have created the universe. If you really want to find a reason for the likely superiority though, try at least to read the Hawking link I gave you. If spacetime began with a singularity, then talking about a “before” then when a creator could have been at work is meaningless.
Also let me put another question? Why is the universe here at all?
That’s a non-question, for reasons that have been explained to you many times. You can only have a “why” if you can demonstrate first that there was an intelligent agency to decide on or care about the why.
How can science demonstrate eternality anyway. How does it propose to find evidence of the universe popping out of nothing since as the universe is here what evidence can there be of the nothing it appeared out of?
You’re collapsing into incoherence again. Science (or theoretical science at least) would demonstrate eternality if it could provide a cogent model in which that was the answer. Alternatively, if spacetime began then question evaporates in any case because there was no time before then.
Present your scientific evidence for any scenario now rather than trying to guff on about what you think I think.
Read the link I gave you to get you started.