Here are some questions i could try:
1. so when did you become a Christian?
2. How will you rate the level of your christian faith?
3. are you aware of false Christians in the church?
4. so are you a true or a false christian?
5. are you aware that not everyone is actually a seed of God?
6. so are you a seed of God?
7. i will like to have a relationship with a true Christian child of God, so please tell me if you are a true christian.
if she says she is true then i will say:
8. that's great, so you really are a true Christian, so you are not in some sort of cult, you are not some sort demon...lol.....seriously, you are not in any cult, are you?
At about question #3, I would have started looking at you funny.
By question #6, I would be backing away slowly.
By question #7, I would have begun reverse-interrogating you about your spiritual discernment (or, shall I say, lack thereof).
If you even got to question #8, I would be conducting an amateur psych-eval.
I'm all for being careful about who you date, and finding a true Christian to marry, and asking serious questions... but for crying out loud... God gave you ears and eyes and common sense (well... to some people, anyway), and instructions about what fruits to look for in true Christians.
Most demon-possessed people give non-Christians the heebie-jeebies, let alone someone who has the Holy Spirit guiding them. (Again, humans can be demon-possessed or demon influenced, but they are not demons. God came to save people, including those who are demon-possessed; demons cannot be saved, they are not humans.)
Sorry... but I feel bad for the girl who ultimately gets subjected to this. Any woman with common sense, true Christian or not, would probably be long gone by the time you were done with your interrogation.