"His mouth is filled with cursing and deceit and oppression; under his tongue are mischief and iniquity." Psalm 10:7
"He says in his heart, 'God has forgotten, he has hidden his face, he will never see it.'" Psalm 10:11
"Why does the wicked renounce God and say in his heart, 'You will not call to account'?" Psalm 10:13
Did you know that there was a time when there weren't atheists?? Yep, back when people were so close to the creation event that they couldn't deny God's existence. There were still sinful people who rebelled against God, but no one who said He didn't exist. But by the time of David there were already atheists. People who would say there was no God and at the same time hate God. How can you hate someone who doesn't exist?? How can you say "There is no God" and then say "God has forgotten"??
What else does the bible say about atheists?
"The fool says in his heart, 'There is no God.' They are corrupt, they do abominable deeds, there is none who does good." Psalm 14:1
But, they are without excuse...
"For what can be known about God is plain to them, because God has shown it to them.For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse." Romans 1:19-20
And, Job 12:7-25...
7"But ask the beasts, and they will teach you;
the birds of the heavens, and they will tell you;
8or the bushes of the earth, and they will teach you;
and the fish of the sea will declare to you.
9Who among all these does not know
that the hand of the LORD has done this?
10In his hand is the life of every living thing
and the breath of all mankind.
11Does not the ear test words
as the palate tastes food?
12Wisdom is with the aged,
and understanding in length of days.
13 "With God are wisdom and might;
he has counsel and understanding.
14If he tears down, none can rebuild;
if he shuts a man in, none can open.
15If he withholds the waters, they dry up;
if he sends them out, they overwhelm the land.
16With him are strength and sound wisdom;
the deceived and the deceiver are his.
17He leads counselors away stripped,
and judges he makes fools.
18He looses the bonds of kings
and binds a waistcloth on their hips.
19He leads priests away stripped
and overthrows the mighty.
20He deprives of speech those who are trusted
and takes away the discernment of the elders.
21He pours contempt on princes
and loosens the belt of the strong.
22He uncovers the deeps out of darkness
and brings deep darkness to light.
23He makes nations great, and he destroys them;
he enlarges nations, and leads them away.
24He takes away understanding from the chiefs of the people of the earth
and makes them wander in a pathless waste.
25They grope in the dark without light,
and he makes them stagger like a drunken man.