Alma 17

Even though Mormon describes the nature of the Lamanites, he also suggest that qualifications for the atonement of Jesus Christ are the same, teaching that they were -

"...a wild and a hardened and a ferocious people; a people who delighted in murdering the Nephites, and robbing and plundering them; and their hearts were set upon riches, or upon gold and silver, and precious stones; yet they sought to obtain these things by murdering and plundering, that they might not labor for them with their own hands.
15 Thus they were a very indolent people, many of whom did worship idols, and the curse of God had fallen upon them because of the traditions of their fathers; notwithstanding the promises of the Lord were extended unto them on the conditions of repentance."  (Alma 17:14–15)

The promises of eternal life and the atonement of Jesus Christ are extended to all "on the conditions of repentance".