That is like saying, that before "Time", there was no time. But then, "Time" started.
How long was it before time started? A trillion years? and that passed, and then, "Time" started.
How could time wait until it was time to start? Isn't that sort of...illogical?
Just as, "Time slows down as things speed up" Like a person in a space ship traveling at the speed of light ( allowing that to happen, for this scenario). Lets say that light leaves a planet and the space ship does so at the same time. They both arrive at another planet, 40 years later. The light has traveled 40 years, and so, supposedly has the space ship. But the people inside the ship are only 1 year older. How can that be?
Is it possible for the outside of the ship to travel for 40 years, but the inside only 1 year? Or does the whole ship age only 1 year, although it traveled 40 years.?
If time slowed down for the whole ship, wouldn't it still be traveling 30 years away, somewhere, heading for the planet? That means that it therefore did not travel at the speed of light, but at 1/40th as fast.
Multiple universes...if there is more then one...two maybe..there would then have to be an infinite number of universes. ..an un ending number of them. Why? Because each universe would be a different one then this one. That means that for every conceivable thing that can happen to our universe at any one time, there is a universe out there that is different, it didn't happen that way.
Let's say that I smash my little finger in this universe, and I cuss. In another universe, I smash my second finger, not my little one and I cuss. In another one, I don't cuss. In another one, I smash still another finger, not the first two I mentioned. and in another, I don't even smash my hand at all. In one, I am tall and dark haired, in another, tall and light haired, in another I am tall and no hair, and still anaother, I am short and fat, with long hair..and....
Get the idea?
Billions times billions of possible scenarios, just for one person, just for one second of time. How about all the people, for thousands of years? How many universes would there then be? One for every little thing they did, and the choices they made. Each universe will have one choice, or not.
Suppose Computers were not invented, we wouldn't be here writing.. not in this Universe, anyway, but maybe in three trillion others we would be, and we would maybe be using Borgess instead of Intel, or Mac. Or maybe we would be using Kennedy computers.
The possibilities are just too many to believe that multiple universes can exist.