Cosmologist Alexander Vilenkin wrote a book in 2006 (Many Worlds in One) in which he refers to a theorem he developed with Alan Guth and Arvind Borde. Although not a believer in God but the mulitverse, Vilenkin says that their theorem proves that even if other universes exist there was an absolute beginning of them all. In other words, one cannot posit a multiverse, as atheists often do, to avoid an absolute beginning.
Vilenkin put it this way: “It is said that an argument is what convinces reasonable men and a proof is what it takes to convince even 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 a cosmic beginning (Many Worlds in One [New York: Hill and Wang, 2006], p.176).”
In a recent debate, Dr. William Lane Craig points this out forcefully and exposes his opponents attempt to take Vilenkin out of context. He also states that Vilenkin’s theorem shows there was an absolute beginning regardless of the initial physical states of the universe.
The bottom line is this: Since there was an absolute beginning to space, time and matter, it’s reasonable to conclude that the cause of the universe must be spaceless, timeless and immaterial. This cause must also be personal in order to choose to create, intelligent to create such a fine-tuned universe, and powerful to create out of nothing. A spaceless, timeless, immaterial, personal, intelligent, powerful Being is exactly what theists call “God.”