The Christian faith is a faith of mysteries. We worship one God and yet our one God is three persons, Father, Son and Holy Spirit. We worship our Saviour Jesus Christ, the Son, who is wholly God and wholly man.
We are told in Scripture that God created us free moral agents and that we are fully responsible for every sinful thought, word and deed. We are also told that God has predestined the end from the beginning and that he controls the hearts of men.
These few items barely scratch the surface of the mysteries of the Christian faith.