By using "admits" you mean they accept your point of view, even if they do not want to? Thats a bit telling about your worldview.

And have you ever considered, that cosmology can only make relative observations and speculations?

In other words, if our whole universe is just a small part of a bigger universe, how could we tell for sure, if all we can observe is within those borders?

Also, how likely is it, that out of eternal nothing someday came a whole universe which wents back to nothing forever?

Sounds more like religion than science.