I think you are thinking of jason, who DOES preach a works based (sinless perfection) notion.
My belief is that no works can save anyone. Only faith in Christ provides eternal salvation.
I also believe that faith in Christ doesn't automatically mean that the believer will produce good works. Yes, we were created in Christ Jesus FOR good works (Eph 2:10), but because of the overwhelming commands throughout the NT epistles regarding fruit, works, etc, it is clear that they aren't guaranteed for the believer. iow, I reject the doctrine of the perseverance of the saints. Not all saints will persevere in the faith, which is why Barnabas and Paul visited a number of churches to encourage them to "stay true to the faith", or "remain in the faith".
Acts 11:23 - When he arrived and saw the evidence of the grace of God, he was glad and encouraged them all to remain true to the Lord with all their hearts.
Acts 14:22 - strengthening the disciples and encouraging them to remain true to the faith. “We must go through many hardships to enter the kingdom of God,” they said.
If true belief in Christ results in perseverance, there would be no need for such encouragement. It would be automatic. The fact that believers do need encouragement to remain true to the faith is because of the possibility that some won't. Just like the second soil, who "believed for a while, but in time of testing, fell away", per Luke 8:13.