Atheists are not the "worst of the worst" in Islam simply because the concept did not exist in the 7th century. Islam's enemies are the groups it struggled against and tried to coopt in its early history: the Jewish tribes in the Arabian Peninsula. Mohammad tried and failed to convert these tribes and the insults and setbacks he suffered at their hands became doctrinally enshrined in the religion and made them the eternal enemy of the faithful.
It's why one sees the unique salience of the "Palestinian issue" among Muslims today, even in the face of similar injustices being perpetrated against Muslims in other parts of the world. This is because the hated Jews occupy and hold Islamic holy land - the place where the Prophet was lifted up from Earth into Heaven for an audience with God. This is an intolerable doctrinal assault on the tenets of the religion and it's why the jihad is directed against Israel and the Crusader West. In contrast, who cares how many Rohingya villages the Tatmadaw put to the torch? How does that disturb Islam?
In contrast to this ideological hatred of Jews, Mohammad had barely anything to say about China. It's doubtful he even knew it existed. That indifference is inherited by his followers as all his teachings are.
I agree Atheist are not ''the worst of the worst''
Muhammed actully forbid people from attacking China in the hadith and that is why China was spared from the expansionism era and I know alot of chinese think they could defend but the truth is they couldn't if the decision had gone in.. More than Half of Europe fell during these period and approx half of the known world during that era.