Backslide v. i. : To slide back; to fall away; esp. to abandon gradually the faith and practice of a religion that has been professed.

Example:
How do you know you are a saved if you Backslide your whole life?

Taxonomy
backsliding, Backslide, free encyclopedia, dance, Christianity, search, phenomenon, describe a process, pre-conversion, habits, lapses, churches, doctrine, Historically, biblical Israel, the New Testament church, the story of the Prodigal Son, representation.

Defination from the web:
Backsliding is a term used within Christianity to describe a process by which an individual who has converted to Christianity reverts to pre ... Historically, backsliding was considered a trait of the biblical Israel which would turn from the Abrahamic God to follow idols. ...