when God created the earth, he looked at everything he created and said it is good. the only that he said was not good was the fact that Adam had no partner which he eventually made for him. it was when the devil came and deceived eve that sin entered the earth and man became full of evil cos the glory of God had departed 4rm him. this led to Cain killing his brother Abel out of envy. u dont think that God taught Cain how to do that, do you? this was how evil started & hav continued till today. what we are experiencing today is the consequences. Believe me, God doesnt like what is happening on the earth he created. thats why he wants everyone to repent cos hes going to destroy this earth and build a better place.