Emphatically - No!
Most people define the universe as everything that exists. Well, this universe may be everything MATERIAL that exists but it is certainly not EVERYTHING that exists.
There are some people who imagine that there are an infinite number of universes in existence. These are the same people who tell us that they live and die by the scientific method of knowing - i.e., they only believe something if it is detectable, measurable, testable yaddah, yaddah, yaddah. Well these people have no proof of an infinite number of universes.
Nothing like that has been detected.
Yet they believe.
Such is the desperate faith of these people.
On the other hand, we do know of ONE other universe that is distinct from our own. In the thin spots of our journey, we can almost but not quite see into this other dimension. Some, Paul, Stephen, John and perhaps a few others not recorded have been allowed glimpses of it.
Jesus demonstrated some of its qualities for us.
Near the end of His time on earth, Jesus moved back and forth between the two universes or dimensions. Sitting on the shore of a lake after His resurrection, Jesus ate lunch with his disciples in THIS universe of space, time, matter and energy. Just prior to this, as Jesus returned to the other dimension, He passed completely through grave clothes, held together like cement with 75lbs. of embalming spices. He moved unimpeded through the stone walls of the tomb with a body as visible as yours and mine. He appeared to hundreds of people, ate with them, spoke with them, visible to them but no longer bound by the space / time dimension and the laws of physics. In fact, at His ascension, Jesus proved that the laws of physics, such as gravity no longer had any hold on Him as He moved from this universe into the ONLY other universe / dimension that we know of.
We know that one other dimension exists because:
. the 2nd Law of Thermodynamics,
. the expansion of the universe,
. background radiation, and
. the Borde-Guth-Vilenkin Theorem* all demand that any universe with a definitive space / time boundary, a beginning, a Singularity, a Creation event demands the existence of a Supreme Causal Agent from the other realm.
* The conclusion they reached is that any model of an expanding universe, be it theoretical like "atheist origin of the universe mythologies," or real, such as our own, is geodesically incomplete, or past-incomplete without a past finite space / time boundary.
It used to be the case that those atheists who were rightly terrified of the implications of a universe with a beginning could hide behind our ignorance of pre Planck time events. In fact, those who remain ignorant regarding this theorem continue to say, “We just don’t know,” as though that somehow absolves them of their ignorance. It does not.
The Borde-Guth-Vilenkin Theorem does not depend upon any physical description or knowledge of the pre Plank time era. This theorem rids atheists of any hope of avoiding a singularity, a beginning, a Big Bang Creation Event. This is true PARTICULARLY for Dawkins’ favourite myth, the eternal inflationary multi-verse. What we know of Dark Matter also rids us of any hope for oscillating models.
I leave you with the words of Vilenkin himself.
“It is said that an Argument is what convinces reasonable men, and a Proof is what it takes to convince an unreasonable man. With the proof now in place, cosmologists can no longer hide behind the possibility of a past-eternal universe. There is no escape, they have to face the problem of the cosmic beginning.”
Alex Vilenkin, “Many Worlds In One - The Search for Other Universes,” 11