So did he become a god, or was him being an angel a typo?
As far as I know, there is only one
real god, the one. All the others - Lugus, Bhaal etc. and also Mammon - were originally archangels, each of them provided with controll over one aspect (in Mammon's case for example foresight->greed).
However, since the one is...absent, the archangels, being quite powerful anyways, are as close to "God" as it gets.
Your confusion is probably due to the fact that the archangels in turn created other minions and "archangels", like for example Hyborem to Agares. Moreover, some of these even rose through the ranks later on.
Your standard Erebusian however has not even the tiniest idea about the actual truth behind "gods" and "archangels", so for everyday life Mammon and the rest
are gods.
(Well, that's my idea of it, but probably someone else can still explain it better ^^)
On the topic of Esus or Mammon being meaner: I would say Mammon is. Esus is a backstabber, granted. But at least, you can rely on him or his followers sooner or later trying to stab you. With the Stuarts, matters are more complicated...
Off topic: Yep, this is a first post. By a long-time lurker, admitedly.
Normally, I would now start bragging on and on about how good the mod is or how grateful I am to you for creating it. But in this case, I will spare you, Kael and co., all that. You know you did a great job. I know you did a great job. That's it