“Holy, holy, holy, is the Lord of hosts: the whole earth is full of his glory.” Isaiah 6:3
God is holy. So holy that sin cannot exist without his doing something about it. Since he is holy, sin has to be punished. Since he is loving, he was willing to punish his son Jesus for our sin instead of us. All he asks is that we put our trust in him.
Look around at the created world. You will find evidence of God everywhere. He is revealing himself to you so that you will trust him.