Sort of. To elaborate, the idea is that a Christian (someone who has accepted Jesus as Lord and Savior) will show an outward transformation into someone who is

Sort of. To elaborate, the idea is that a Christian (someone who has accepted Jesus as Lord and Savior) will show an outward transformation into someone who is Christ-like and obedient to God. When this doesn't happen at all, and that they remain completely un-Christian, you know it isn't genuine (See Matthew 7:15-20). The idea of how a Christian is shown by their outward renewal also touched on in Romans 12:9-21, Galatians 5:16-24, etc. It's not a perfect process, and it's the renewal is not a pre-requisite to salvation but rather an end result of salvation (Ephesians 2:8-12). Therefore, Christians have a framework that can be used to identify and rebuke people who distort the teachings of Christianity into something that is in rebellion to God. This doesn't really exist with secular philosophy, which lays out the "ideal" but has no way to prevent itself from being warped.