When Jesus returns to this Earth, atheism will be proven to be a temporary condition.
Revelation 6:15–17 MEV – Then the kings of the earth and the great men and the rich men and the commanding officers and the strong and everyone, slave and free, hid themselves in the caves and in the rocks of the mountains. They said to the mountains and rocks, “Fall on us, and hide us from the face of Him who sits on the throne, and from the wrath of the Lamb, for the great day of His wrath has come. Who is able to withstand it?”
However, given the hardness of the heart… That temporary condition has eternal consequences. When even knowing that return of Jesus before He is even seen they run and hide. Great plagues follow. There is a holocaust brought upon the earth by men. And what happens to all of those “believers” that hid underground and survived these?
Revelation 9:20–21 MEV – The rest of mankind, who were not killed by these plagues, did not repent of the works of their hands. They did not cease to worship demons, and idols of gold, silver, brass, stone, and wood, which cannot see nor hear nor walk. Nor did they repent of their murders or their magical arts or their sexual immorality or their thefts.