1) Psalm 19:1; The expanse of the heavens declares that there is a God.

2) Romans 1:18-20; The inner man understands that there is a God
    because of creation.

 3) Ecclesiastes 3:11; The heart reveals the eternal desires of man.  Man
     knows there is more to life than just this earthly existence.  Man
     knows that there is an eternity.

4) Conclusions: The Bible declares that there is a God, the Creator God,
    the God of the Bible.  Hebrews 11:6 says, "And without faith it is
    impossible to please Him, for he who comes to God must believe that He
    is, and that He is a rewarder of those who seek Him."  From the reaches
    of the universe, to the inner space of the soul, God is revealed.  Seek the
    God of the Bible and you will find Him.