Scripture tells us that God is a Holy, righteous, just God who is loving, merciful, and gracious.
We are created in the image of God, we have fallen but are redeemable.
The dilemma is how do we get back in touch with a Holy, righteous and just God?
The way God has initiated it a way where human beings can come back to him, it would require a perfect man, representative of humanity who at the same time is perfect God, who will lay down His life as a sacrifice for the sins of fallen humanity
A perfect God and a perfect man in the same person is in very short supply. In fact we only know one... Jesus.
Jesus alone was a suitable sacrifice to bring a sinful humanity back to a Holy God.