I'm not too big of a fan of fantasy that has magic be an everyday sort of thing, and I also tend to have a liking to fantasy the deals in sort of divine influence. Only series that i seem to enjoy that utilizes day-to-day magic is Elder Scrolls.
I was really thinking of Bionicle when I came up with the idea "Everyone can use magic". Though it's a skill like anything else. Anyone can use magic but most people don't control it very well, people who practice with it and build it up are the wizards.
Also I forgot to mention something: Malkhar is a lot like earth, in terms of technology and science and all that. It's just they have magic along with that. So Malkhar and Earth meeting would be less chaotic than one might think.
Religion plays a major role in the development of people's character and identity, having such influences in a story could add immersion rather then saying a necromancer pops and causes trouble where there is not sacred god-given law that says that that is evil in the first place.
There have been previous necromancers. The reason they're considered evil is the fact they age so fast. In order to live a normal lifespan, they have to use their power to leech off the life of others (They could live forever as long as they had people to leech off of). That, and controlling life and death so naturally would cause them to go power-mad. Eventually the people of Malkhar realized no good would come of a necromancer, so whenever they find some they try to kill them. Mendumen ran and hid until he had enough power to defend himself, so that's how he survived.
I'm not sure what Malkhar's religion would be, or even if it has one at all. Since everyone can use magic, it seems like the line between a god and an ordinary person is much more blurry.
Another thought: In the Narnia books, you don't see any churches or anything or any organized religion (Well, excluding the Calormenes) but it seems like everyone does know who Aslan is and worships him. Just not in the temples and cathedrals you would expect. Maybe that's the feeling I'm going for with Malkhar.
Oh, and another thing, I think that this topic would be better suited for Off-Topic Culture.
I swear the editor said "Posting in Off-Topic Culture"...