If God created it in that state then they should be curious to understand that creation. They look at rainbows as the beauty of creation but not the fact that lead exists in these crystals. It’s all equally beautifully complex. So why not try to understand it.
If God made the world look like it was created billions of years ago there must be something worth learning from that, even if you believe it was snapped into existence 6000 years ago.
Tbf for your specific example, rainbows are specifically mentioned and “explained” in the Bible. After drowning all life on Earth except for Noah and a bunch of inbred animals, God sent the wainbow down as a pwomise that he would nevew do it again 👉👈