The God of the Bible is not a god of mythology. atheists call Him mythology because atheists are without God in this world Ephesians 2:12, they are blinded by the god of this world Satan 2 Corinthians 4:4, atheist and those who worship false gods and false religions are spiritually dead in their trespasses Ephesians 2:1-3, the message of the Cross is foolishness to those who are perishing, the fool says in his heart that there is no God nor there is no sign of God yet we are surrounded by proof of a creator, you would not exist if God did not exist since He did create Man in the Beginning, I hope that helps.