I think this is an example of athiesm being used to justify imperialism in much the same way that Christianity used to
"those people are savages who worship false gods and need to accept Christ"
"those people are savages who worship false gods and need to accept secular humanism"
the poster seems to be an Indian nationalist of some sort
I think it's a new trend in athiesm as previously athiesm wasn't an accepted part of the established order but I think people like Christopher Hitchens made a devils bargain so to speak to in exchange for political legitimacy play the same role in justifying colonialist violence as Christianity used to
I have known athiests who speak about Muslims (it is almost always Muslims as they are the enemy de jour) using language and points I recognise from 18th century colonial justifications