You should probably realize that to an atheist, this sort of threat is equivalent to someone telling you that Captain Hook is going to torture you after you die if you like Peter Pan more than you like him.
God gives a desciription of what atheist will be doing when he comes.
Rev 6:14 And the heaven departed like a scroll when it is rolled together. And every mountain and island were moved out of their places.
Rev 6:15 And the kings of the earth, and the great men, and the rich, and the chief captains, and the mighty men, and every bondman, and every freeman, hid themselves in the dens and in the rocks of the mountains.
Rev 6:16 And they said to the mountains and rocks, Fall on us and hide us from the face of Him sitting on the throne, and from the wrath of the Lamb;
Rev 6:17 for the great day of His wrath has come, and who will be able to stand?