I don't really approach the whole social interaction of religious interlocution in this way. Sure, I could ask some tough questions. However, when it comes to religion, which is quite a different situation from an epistemic state, say, at the auto repair shop where I'll want to know if the mechanic actually did all of the repairs I asked for and for which I'll be paying, I'm going ask the other person why and how they arrived at their present form of belief. It may very well turn out that not only is their reasoning different than mine, but their whole notion as to just what justification is in the first place may be different than mine, along with the method to demonstrate it (if possible). They may also have different ideas as to what constitutes truth, evidence, proof, and/or the demonstration of these things.
Furthermore, if they want me to believe what they believe, I'm positive there will be other social and psychological issues involved in the interactions in addition to the problem of whether or not I think their position is valid, such as whether or not they have a sword to my throat or if they have me strapped down on a red gurney and plan to connect me to live voltage ... There's also the issue of whether they are motivated to listen to anything I might have to say.