How you become a demon

The premise here is that no one is created as a demon, but demons exist so they have to come from somewhere right? This thread is to explain where demons come from as well as the process of becoming a Fallen Angel ^^

1) Human dies
2) Human becomes a soul
3) Human soul is judged
4) Soul is found guilty of sin
5) If the soul is tainted enough it changes form into that of a demon
6) The soul keeps it's human name now that it's a demon


Becoming an Archdemon;
1) Demon is formed from a human soul
2) Demon grows stronger from battle
3) Demon wants to be an Archdemon
4) Demon fights the Archdemon it wants to replace
5) Demon wins fight and takes over as that Archdemon
6) Takes on the Archdemon's name


Becoming a Fallen Angel;
1) Soul is judged to be good
2) Soul becomes an Angel
3) Angel decides to swap sides
4) Angel allies with demons
5) Angel becomes a Fallen Angel