Satan already knows about the glories of God and has rejected being a part of it. God must judge sinful man. It would be just as wrong for God to allow disobedience to go unchecked as it would be for a judge to allow a law-breaker to continue his actions without fear of punishment. Since God can do no wrong, He is compelled by His own all-good nature to judge. The flood record in Genesis 6-8 is physical proof of God's hatred and judgment of sin.
Geologists study the layers of rock of the earth's crust.
For a little over 150 years, it has been believed that these layers were laid down slowly over millions of years, but with such overwhelming evidence throughout the geologic record of catastrophic upheavals that cannot be explained by continuing natural processes, some geologists are abandoning this theory for one involving great catastrophies. Another reason many geologists are modifying their interpretation of the rocks is that the layers were laid down by water all over the earth. Of course, they will not admit to a single, planetary cataclysm, but will believe in many local catastrophies. In these rock layers are buried billions of remains of plants and animals called fossils. Now, if one sees billions of dead things buried in rock layers laid down by water all over the earth, the logical conclusion is a cataclysmic planetary flood as described in detail in Genesis.