Why is legalism considered deceptive?

Legalism often presents itself as a form of righteousness that demands adherence to laws or moral codes to gain God's favor. In Galatians 5:4, Paul warns, 'Christ has become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.' This imposition of human standards can be subtly persuasive, leading individuals to believe they can attain righteousness through their works. However, this undermines the sufficiency of Christ's atoning sacrifice and results in spiritual bondage rather than freedom. Therefore, legalism is insidious as it distracts from true faith and promotes self-reliance.