Final answer:
In Protestant Christianity, Jesus Christ is the sole figure considered sinless, aligning with the doctrine of Sola Scriptura and the emphasis on salvation through faith in Christ.
Step-by-step explanation:
In Protestant Christianity, the only figure believed to be sinless is Jesus Christ. This belief is central to Protestant theology and distinguishes it from some other Christian traditions which may also venerate Mary, the mother of Jesus, as sinless.
Protestantism holds to the doctrine of Sola Scriptura, which emphasizes scripture alone as the source of authority and states that salvation comes through faith in Jesus Christ, who lived a sinless life and sacrificed Himself for the sins of mankind.