Where did GOD come from?

Many times the question has been asked "where did God come from?" The atheist would mockingly say "who made God?" But I say to the atheist, if you believe in the big-bang and evolution, "How did something come out of literally nothing, by itself, at some point?"
Peter tells us But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear: 1 Peter 3:15
The atheist believes that something literally came out of-NOTHING. As for where God came from,well-He has always existed. That may be hard to grasp, but it doesn't mean its not true. 

Christ said Consider the lilies how they grow: Luke 12:27 So lets start there - First there are plants. They exist, but serve a purpose. Second, there are animals. They exist and have instinct. Third, there are humans, who exist with both instinct and the ability to reason. Our brains can comprehend FOREVER in the forward direction from a starting point of the arrow of time. But we have a hard time grasping the concept of the arrow of time in both directions, without a starting point. Still, the whale can't comprehend that 2 apples and 2 apples = 4 apples. But you know they do. The point is, just because your mind can't comprehend easily the arrow of time stretching for eternity in both directions does not mean that it doesn't. Maybe the next level of intelligence can comprehend it. God is like the number pi (3.14) that stretches for infinity. Mathematicians can't unravel the number. Some have nearly gone insane trying-literally. The number pi is called the "eye of God" by some scientists. Its number is in the disk of the sun, in the ripple on the pond from the falling rain drop-its everywhere. And it stretches for infinity. So, where did God come from?
 Answer: He has always been, thats why HE is called the GREAT I AM, the ALPHA and OMEGA. God stretches for infinity. (Well, its more of an answer than atheists have who believe at some point in the past something came out of LITERALLY NOTHING). I am Alpha and Omega, the beginning and the end, the first and the last. Revelation 22:13 And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you. Exodus 3:14