I haven't really met a deity as such, but as an atheist I once wondered what would happen if I prayed in a lucid dream. I tried it twice, with different outcomes.

The first was when I was wandering around, trying to think of something to do. So the idea of praying came to mind. I knelt down, held my hands together and muttered a few words. When I stood back up, I was holding an umbrella. It wasn't even raining. I was quite confused. Especially since it broke after I tried to open it.

The second was during a lucid nightmare. I was pretty damn scared at the time, and wondered what praying might do. So, as last time, I knelt down, held my hands together, and I heard my own voice talking. I couldn't understand what it was saying, but it was pretty creepy so I just ran away.

That's about as far as I go with religious experiences. Maybe I'll try meeting a god at some point...