God did not say or make a promise that He would never again judge the Earth, but only that He wouldn’t do so through a worldwide flood.

Scripture records that God has judged the Earth and its inhabitants numerous times after the Genesis flood. The rainbow is a creation of Almighty God proclaiming a covenant promise that He would never again flood the Earth in judgment as He did in the Genesis flood of Noah’s time. The rainbow shall be in the cloud, and I will look on it to remember the everlasting covenant between God and every living creature of all flesh that is on the earth.” It shall be, when I bring a cloud over the earth, that the rainbow shall be seen in the cloud and I will remember My covenant which is between Me and you and every living creature of all flesh the waters shall never again become a flood to destroy all flesh. And God said: “This is the sign of the covenant which I make between Me and you, and every living creature that is with you, for perpetual generations: I set My rainbow in the cloud, and it shall be for the sign of the covenant between Me and the earth.