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
