Atheism has been mischaracterized, misbranded by the powerful noise of current secular atheists for what classical atheism is: without god, not seared unbelief.

that ye were at that time separate from Christ, alienated from the commonwealth of Israel, and strangers from the covenants of the promise, having no hope and without God [ATHEISTS] in the world. Ephesians 2:12 ASV.B 

Atheism (biblical) is biblical. Exodus 20:1-6, Isaiah 45:21
Psalms 14:1 sees those who say that there is no God as foolish
The adherents of secular atheism claim that etymologically they do not believe in any gods nor in the existence of gods. Believers are usually afraid of atheists for whatever reason but in reality, the First Atheist is God (Jesus).

Psalms 14:1 ASV
(1)  For the Chief Musician. A Psalm of David. The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works; There is none that doeth good.

that ye were at that time separate from Christ, alienated from the commonwealth of Israel, and strangers from the covenants of the promise, having no hope and without God [ATHEISTS] in the world. Ephesians 2:12 ASV.B