The New Testament, which talks about Jesus' birth, ministry etc, says that God is love.
Jesus, who was God, told us that God is perfect, Matthew 5:48, and that he is a loving Father who knows how to give good things to those who ask him. When he was once asked if a tower fell on some people and killed them because they had sinned, he said "no", Luke 13:4-5.
The New Testament says that Jesus laid down his life for sinners, those who did not deserve mercy from God. Romans 5:8, 1 Peter 2:10. That he was made sin for us, 2 Corinthians 5:21.
The New Testament says that through Jesus we have peace and reconciliation with God, Romans 5:1, Romans 5:12.
James says that every good and perfect gift is from God, James 1:17
It's not the BIBLE which says that God created evil, but the Old Testament - in which people did not have the full revelation of God.
The New Testament does not say that. The message of Jesus, and the cross, is that Christ gave his life for sin, Mark 10:45, Matthew 26:28. As he has borne the punishment for our sin, God does not punish again by making people ill.