http://dictionary.reference.com/search?q=vision
1.the act or power of sensing with the eyes; sight.
2.the act or power of anticipating that which will or may come to be: prophetic vision; the vision of an entrepreneur.
3.an experience in which a personage, thing, or event appears vividly or credibly to the mind, although not actually present, often under the influence of a divine or other agency: a heavenly messenger appearing in a vision. Compare
hallucination (def. 1).
4.something seen or otherwise perceived during such an experience: The vision revealed its message.
5.a vivid, imaginative conception or anticipation: visions of wealth and glory.
6.something seen; an object of sight.
[...]
I think you would prefer definition three then.
But if ultimately God exists, it would be definition four or six.
The ambiguity is intentional.
I don't know, personally I knew about these different meanings of the word vision, and honestly the first definition that comes to my mind is "hallucination." So maybe you'd never heard it used this way before? I'm just trying to figure out why there's all this miscommunication. Let me know if you have any ideas.
The Purple Knight, who is now going to fall over from exhaustion
PS I am not trying to define words for you, I am just trying to show you why I chose the word I did. If you can think of a better, clearer way of expressing "vision of God" (perception of God) that is amenable to both theists and atheists, Please, do let me know.
Thx,
le Chevalier Violet, qui va maintenant aller s'endormir d'epuisement