Put simply, some people just love an argument. When I’m dealing with non-believers who just want to put Christians down, I’ll answer their questions or counter their objections, but I’ll do it briefly. If it gets to the point where they continuously belittle me or my faith that means it’s time to drop the conversation. I find, if you stay in these conversations too long, it may shake your faith and cause you to doubt what you believe.
However, if a non-believer genuinely wants to know about Christianity, then it’s important to go in depth and give them as much wisdom as they can handle. This is the person you want to really focus on. This is the person that’s open enough to take what you have to say seriously.