Atheist often claim that only real scientists believe the universe had no beginning and is eternal in the past. Well, Stephen Hawking (who is no friend to theism or Christianity) believes the unvierse and time had a beginning at the Big Bang. The Big Bang is important for the Kalam Cosmological Argument, especially its second premise that the universe had a beginning.
"Almost everyone now believes that the universe, and time itself, had a beginning at the Big Bang."
- Stephen Hawking and Roger Penrose, The Nature of Space and Time, The Isaac Newton Institute Series of Lectures (Princeton, N.J.: Princeton University Press, 1996), 20