Right there is the error.
The only way to have salvation is through faith in Christ.
Paul warned the Galatians about listening to a false gospel.
Roman Catholics would do well to listen to Paul and reject this idolatrous false teaching.
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6I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel;
7which is really not another; only there are some who are disturbing you and want to distort the gospel of Christ.
8But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!
9As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed!
Galatians 1:6-9 NASB