Because it doesn't depend on me it depends on him
It’s not my job to make myself whole or free from sin. Other than have faith, there is nothing I can do to accomplish that.
Also, Romans 4:4-5 NIV says:
4 Now to the one who works, wages are not credited as a gift but as an obligation. 5 However, to the one who does not work but trusts God who justifies the ungodly, their faith is credited as righteousness.
To help improve the meaning of these lyrics, visit "Why I Hate Religion, But Love Jesus (Spoken Word)" by Jefferson Bethke and leave a comment on the lyrics box