Agreed but why do so many not ?..Knowing that a man is not...

Agreed but why do so many not ?
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Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
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Therefore we conclude that a man is justified by faith without the deeds of the law.
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But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.