First, though, I'd like to clarify that all "magick" is evil in my world. Usually, it is either trickery or of demonic origin. There is no "white" magick.

In my book magic is evil too, realy, magic is just bad. I couldn't even think about having my good guys do magic.

Exactly. That's how I feel about it. In a trilogy that I'm going to write, my main MC practices sorcery and all kinds of black magick, but that's while he's a villain. During the story, he goes through a bunch of turmoil and comes out realizing just how evil magick is.

Magic tends to be rather convenient, much like flexing your arm. It comes when you want it to. Miracles don't work in the same way, they work when God finds it best.

So how does the Lith know the future? Does the Lith have vision or is it giving an educated guess because of it's intelligence?

I agree that magic should only be bad...unless you have a God character (like Aslan) or someone sent from God...an angel basically (like Gandalf). Anything apparently 'magical' or even 'miraculous' that is portrayed as good, should point to God as the one who does it.

Hmmm, I would prefer miracles to be said as such. Magic tends to be rather convenient, much like flexing your arm. It comes when you want it to. Miracles don't work in the same way, they work when God finds it best. And when a miracle happens it will overpower any evil present (So no magic battles). Not that miracles shouldn't be present, this is Christian fantasy after all but they shouldn't be used like magic is.

I find the best way to get good characters do use magic is to make it Alchemy. Which simply means a science that no one understands yet.

Unless you would count a special talent that God gave to a race as magic. That's really what Gandalf had. The Maiar had special powers, mostly contained in their staves.

Inesdar, a miracle happens every time you flex your arm. (Yes, I know that was cliché.)

Really, what I mean is this: You have a natural ability that is also miraculous. Miraculous because it comes from God, natural because it now belongs to you. So, "Magic" can take three forms.

Demonic power: We generally use this as the powers of evil in our stories.

Alchemy: Simply a science we do (or don't) understand.

A gift: An ability given by God, but operating on a different level than science.

When you say 'a gift from God' do you mean a natural gift (like as Neil of Erk puts it, flexing your arm)? Or do you mean a miraculous one? Forgive me if I missed something. I have a tendency to skim.