It's less that I'm lazy, and more that I think it's a slippery slope, and I tend to respect other people's beliefs as long as they aren't forced on me. If someone says they are Christian, but doesn't follow the Bible 100%, who am I to judge? But I get your points, I'll agree to disagree on if he's Christian or not. He's certainly not the first, nor will he be the last, Christian to be an imperfect Christian in the eyes of some.
Do you hold previous presidents to similar Christian standards?