I have one Christian friend who always likes a debate. He wants to argue over every verse of Scripture, and it just goes on forever. I know he won't budge on a single one, even when it's completely obvious that he has no ground to stand on. But he sucks me in nearly every time. It's difficult for me to just let it go. I want to so bad, knowing that it doesn't do any good, that it's better to maintain unity in the body of Christ rather than break fellowship with him over secondary matters (he's declared me an unbeliever I don't know how many times). I've moved the conversation to private messages before, but I also feel like I need to respond publicly because to not give an answer there appears to simply be ignoring him. I don't want to give the impression to onlookers that I'm disagreeable or that I like to argue over secondary matters. We should be of one mind, united not divided. But I also want to stand for Truth. How do I balance all this? I'm so torn in how I ought to respond to this person.