I think you already forgot that rainbow is mentioned in the Bible, looks like this is the only language you understand. Look at this
Genesis 9:8-16
8 And God spake unto Noah, and to his sons with him, saying,
9 And I, behold, I establish my covenant with you, and with your seed after you;
10 And with every living creature that [is] with you, of the fowl, of the cattle, and of every beast of the earth with you; from all that go out of the ark, to every beast of the earth.
11 And I will establish my covenant with you; neither shall all flesh be cut off any more by the waters of a flood; neither shall there any more be a flood to destroy the earth.
12 And God said, This [is] the token of the covenant which I make between me and you and every living creature that [is] with you, for perpetual generations:
13 I do set my bow in the cloud, and it shall be for a token of a covenant between me and the earth.
14 And it shall come to pass, when I bring a cloud over the earth, that the bow shall be seen in the cloud:
15 And I will remember my covenant, which [is] between me and you and every living creature of all flesh; and the waters shall no more become a flood to destroy all flesh.
16 And the bow shall be in the cloud; and I will look upon it, that I may remember the everlasting covenant between God and every living creature of all flesh that [is] upon the earth.