Fenky
You can make someone doubt their faith? I've been trying for years. I thought it was impossible.
i can give you some hints.
1. quote form the bible all the contradiction and horrors you can find. trust me it get a reaction.
2. ask them why they think the greeks god were wrong and how they can explain why they are older than there explanation for creation
3.ask them if them have free will if they say yes ask them about gods plan(trust me this is just hilarious as they try and work it out) if they say no just shake yer head and walk away because they are sad sad beings with no chance at life