Serious Question for Christians: Per Your Estimate, What's the Approximate Percentage of "Genuine" Believers?

I think people believe, they just don't act. A fully functioning Christian (like Mother Theresa) is pretty rare for North America. There are Christians who are persecuted all over the world, tortured, d and shot for their beliefs. North America has either been blessed (or cursed) by how easy it is to say 'I am a Christian.'