You just said it is beyond human comprehension, then said it is humanly comprehended to be infinite.The universe is beyond human comprehension by classical logic in it's extent.
Baffling as it is, it spans an infinite distance.
There is no "infinite distance", and such a distance is impossible.
Hilbert proved infinite changes are impossible.
The universe has finite particles expanding for a finite time at a finite speed.
When does that become infinite?
What physicists know about the extent of the universe is that it is larger than the observable universe and they cannot measure it.
It is convenient to call that "infinite".
You don't understand this, because you are very naive and enamored with science theory.
I suspect you loved Star Wars and Harry Potter.