I did this with two JW's a few years ago. At first, they seemed pretty average, I had the same idea you had, I thought it might be fun to see what they believe and why and tell them why I believe what I believe and see what they think. I went into it with an open mind having already heard most of the arguments to support religion, but right from the start I could tell they had no intention of changing their minds. They brought up the usual tired old arguments... "The world is filled with design, just look around, how can you deny that someone made this?"... "How do you know what's right and wrong without God?"... etc. They gave me 5 or 6 books filled with religious propaganda that any skeptical person could debunk. Eventually after a few more meetings I could tell it wasn't going anywhere and anything further would just be a waste of everyones time.
The guy kept trying to contact me. I would hear it from my mom when I came home "hey, Wayne was looking for you today..", he even came to my job after I quit accepting his phone calls.
I don't think the bible quotes will do much, you don't get to be the door to door type of believer without having accepted every crazy word in that book already. They'll hear it and most likely dismiss anything you perceive as wrong as justified because God did it and to them, God can't do anything wrong. I have actually had believers justify horrible acts this way, brought that up and they just shrugged their shoulders smugly.
So good luck bro