I respect all human beings, but I did not get their religion, it is more like illusion to me. illusion is something like human can't escape from it, Here is my opinion about how world can end, or how kaliyuga can be end.
- Man vs Man : In this war people don't fight in the name of religion they just want land and wealth. If they get it what they desire, then any world war will be over, but kaliyuga will not end.
- God vs Man: We all know god can not even punish evil or demon if they don't do anything wrong, we all know the story of tripusura. So the kaliyuga will be never end, if only good people live here(Without violence), but due to cyclic period of every yuga it should be end, so GOD can do some kind of illusion to make it happen. I know people can get escape from all of this, because kaliyuga is not hard as other three yuga.
- Religion vs Religion: As I said to make the end of kaliyuga, god can make illusion of adharma, which will fight with dharma and adharma will conquer the world and then lord kalki(the avatar of lord vishnu) will kill all adharma people and make the end of kaliyuga and start satyuga again.
I know in kali puran it is referenced that people in the end of kaliyuga don't pray to god, they will do more sins and hence kalki will destroy all of them, but for me it is partial true, because if people do more sins then they may take birth in other jivas(like animals), and kaliyuga will never end. So What make sense better is, their(Mleccha) illusion dharma(Adharma) will conquer the whole world and then god kalki will kill all of them, so the cycle of kaliyug will end and satyuga can start again. Read this Wikipedia article line(The Padma Purana describes that Kalki will end the age of kali and kill all mlecchas).
So do you think this is how the kaliyuga will be end? Do you think other mlecchas religion(Which establish after kaliyuga) are just illusion? like in trupusura case? I know my question is bit off topic, but my intention is not hurt any human belief (since even if it is illusion then it is created by parbramhan to end kaliyuga, so I respect them). I welcome your atman thoughts in comments box as well, if my question is vote to close.
My meaning of melleche is only about adharma which is establish outside of arya country, since adharma can't establish with santan dharma.
The demon kali family tree is interesting to note, it indicated that people can born with this characteristics as well.