Isaiah 54:17 No weapon that is formed against thee shall prosper; and every tongue that shall rise against thee in judgment thou shalt condemn. This is the heritage of the servants of the Lord, and their righteousness is of me, saith the Lord.
The protection of Isaiah 54:17 does not apply to everyone. It's true. In this scripture its said that this is the heritage of the servants of the Lord. The servants of the Lord are the believers! This is an inheritance passed down from our heavenly Father to His children. If I am not His child, then I cannot receive this inheritance. If I go to my neighbor's house and try to claim their inheritance. Not only will I not receive their inheritance, but I would probably receive something else just for asking.