It's true. A lot of people who call themselves Christian really aren't. They just like the sound of it or like the trust that's connected with the title. They don't go to church, they don't pray, and they don't live by the Holy Bible. But, since they live in a Christian country, they pretend to be Christian. Look at Bill and Hillary Clinton, for example. They both claim to be Christians, but they support the most liberal and anti-Christian policies they can find. They just want to call themselves Christian to gain the trust of unguarded voters who don't really think things through.
I think that's the reason that the numbers for "Christian" divorce is up so high. A very significant portion of the numbers aren't actually Christians. They're liberals or agnostics who just say they're Christian because they like to use it as a title.
Or, perhaps it's better to say, it's not enough to profess a belief in Christ, one must also be striving to follow and become like Christ.