Can atheists convert theists?

[Knight]

When you define God as "creator of the universe" then yes

Well since that's how God is usually defined (or at least very often) then that's the definition I'm talking about. And the one I disbelieve in. Hence why I'm an atheist.

Definitions are people-made by people writing them in dictionaries. You can define what you like. It's just usually common sense to go by the dictionary definition and not make up your own personal ones is all. Why must defining be limited to things that already have evidence of their existence? There are no rules that say you're not allowed to define something that you have merely speculated. Just because evidence hasn't been found for something doesn't mean you can't define it. The point is the thing you are defining lacks evidence so it's irrational to believe in it.

EvF

You are misunderstanding what I am saying. Make up any definition you want for any word, it doesn't matter to me. Anyone can do as they wish, though taking advantage of this may cause very few people to understand you.
That's not the point. Definitions are not the point. The point is where the definitions come from. Languages always provide some limitation, but that's not the point either, nor is the fact that definitions and words are man-made the point. Yes, they are man-made, but the words have meaning when they actually apply to what we know exists.

If I just make up a word, like grobidorf, and then say it is a type of dragon which lives beneath the surface of the Sun this is meaningless because I have never observed or detected a dragon living beneath the Sun's surface, and it is impossible to verify. If I make up another word, God, and say it created the entire universe, this, too, is meaningless because such an assumption is impossible to verify. There is a difference between making up a word, such as "chair" and applying it to something we recognize, and making up a word or concept that has no basis in reality.