As stated before … it's a rejection of God's Word.
2 Peter 3
"Above all, you must understand that in the last days scoffers will come, scoffing and following their own evil desires. …. they deliberately forget that long ago by God’s word the heavens came into being and the earth was formed out of water and by water.
By these waters also the world of that time was deluged and destroyed.
Bear in mind that our Lord’s patience means salvation, just as our dear brother Paul also wrote you with the wisdom that God gave him. He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable as they do the other Scriptures, to their own destruction.