Have you considered what happens when Christians start to fall away, or when they start to backslide and regress?  God expressed his frustration in Jer 8:5 saying,

"Why then has this people turned away

    in perpetual backsliding?

They hold fast to deceit;

    they refuse to return. (Jer 8:5)"

Deceit is almost always present when Christians start to regress. In fact, it's deceit that allows backsliders to get around the pain of leaving God. And like a child taking a piece of duct tape off his skin, it's often done a little bit at a time.  As Christians, let's pray that we don't deceive ourselves, and that if we start to, we realize it quickly and return humbly!