Answer:
The Old Testament and the New Testament both talks of a superior living God, the creation of man and the earth by Him, the coming of Jesus Christ to redeem humanity and also of the trinity of God.
Explanation:
Both the Old and New Testament are part of the Christians' holy book The Bible. They are written by various authors over a span of many years but they both talk of similar things.
Firstly, both were written under the inspiration and guidance of the divine being, God.
Genesis and the Gospel of John talks of the creation.
Both talks of the coming of Christ for the redemption of humanity.
The trinity of God- the father, son and Holy Spirit are all used as medium of communication in both testaments.
Salvation is the focus of both, for everyone.
The main principle of the way to salvation through Christ is the recurring theme in both testaments.