My #1 problem with Christianity, and probably my only problem with it, is the insistence that everyone else believe and follow it to the point of demonizing, shunning, or marginalizing those who don't. If not for this, and for the fact that they constantly try to push Christianity into government, I wouldn't care what Christians do. But when they think you're an evil, baby-eating Satan worshiper if they find out you don't believe what they believe, then I have a problem, because that line of thinking breeds hatred.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.