What percentage of preachers are closet atheists?

If by that you mean are "religious" in the pulpit and when they are at church, but whenever they go out of church they don't pray constantly, don't live in the Word, don't KNOW God, they live just like atheists live when outside of church- I would say in America, that describes a great amount of preachers- i fear telling you a percentage, but its probably much more than 50%.