I had a run in with Mormons several years ago. We had a group discussion. Me on one side and four of them on the other. I can tell you right off you have nothing to fear from their 'knowledge' of the Bible. Two of those guys were 'elders' and addressed themselves as so. It was my experience there that they knew precious little of the Bible but I got the impression that they knew a whole lot about theirdoctrine and that they had a lotof literature to read.
Our agreement to the discussion had been to stay strictly with the Bible and I had a lot of fun. I'm not saying they're alllike that, but those four knew very little.