Jesus Christ Was the Only One Who Could Atone for Our Sins

There are several reasons why Jesus Christ was the only person who could be our Savior. One reason is that Heavenly Father chose Him to be the Savior. He was the Only Begotten Son of God and thus had power over death. Jesus explained: “I lay down my life, that I might take it again. No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again” (John 10:17–18).
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Jesus also qualified to be our Savior because He is the only person who has ever lived on the earth who did not sin. This made Him a worthy sacrifice to pay for the sins of others. - By LDS.ORG