Faith

Sliders!

You who are trying to be justified by the law have been alienated from Christ; you have fallen away from grace.
— Gal. 5:4

There's a form of backsliding that looks like taking the Lord's name in vain, claiming to be his but behaving like the world we were rescued from. Churches make much of this. But there's a more insidious form of backsliding that causes so much trouble: sliding back onto the law to prove our 'goodness.' The only thing that matters is faith expressing itself through love (two verses later).