In the era of rising of the system of Mahdi, there needs to be the opposition, the anti-Mahdi movement. If there was not the dajjal (antichrist) and sufyan then there woudn’t be Mahdi; likewise if there wasn’t characters like Darwin and Marks there wouldn’t be Hazrat Mahdi (as). Atheists are too, the ones that increase the enthusiasm of the system of Mahdi. Allah creates all of these specifically for a purpose. - Harun Yahya