James 2:24 states that "It's by faith alone" And this is the correct interpretation.
James is not arguing that faith doesn't matter. And he is not denying that through faith alone we are saved by God's grace. He is simply noting that the "faith which saves" is something more than an opinion. Instead, James is arguing for exactly what Paul wrote in Ephesians 2:10: That the God who saved us by His grace through faith—and not in any sense through works—planned all along for His believing children to do good works, "that we should walk in them." Once we are saved. That's what true believers do.