How do we know that God exists?

Scientifically speaking, we cannot prove the existence of God.  We cannot audibly hear Him, we cannot see Him, we cannot touch Him, we cannot taste Him, and we cannot smell Him.  So how do we know that God exists?  We know that God is there because that knowledge has been placed in our soul from birth.  Any child of a young age will gravitate towards Godly people and love to hear about what He has done in the Bible.  Also, creation itself is testimony of God’s existence (Romans 1:20; Psalm 19:1).  The complexity of the universe and everything in it marvels the mind and points to the Creator.  Only those who willingly choose to ignore these things end up denying God’s existence to their own folly and foolishness (Job 21:14-16; Romans 1:21-25; Psalm 14:1).