Gettin' In Tune,
For not make you waste your time, and by the way you are trying to lead the conversation, I think you rather seek some religious people and put them your questions.
Those people yes, they're convicted that God exists, they even know who is the true God, etc.
They're far more suitable to reply to you on those subjects than Agnostics.
EDIT:
I would recommend my grandmother, Methodist fanatic, she would talk over and over to you... unfortunately you would need to know or learn portuguese or won't be able understand her.
Other than that, one time I got really amazed by the skills of Jehovah's Witnesses, two of them came to me start speaking and when quoting from the Bible they ALWAYS managed to open their Bible directly on the page they quoted (and as far as I could noticed there weren't bookmarks on their Bible)... now that's Biblical skill
