My question is, “ If a person who has right belief in the oneness of Hashem, and he believes that the Torah is word of G-d, and all the prophets are true and he believes in the Divine judgment and final reward and punishments and he believes in the olam haba and he believes in the all the angels and predestination and all the books and he believes in the shewa mitzvets of Noach, and he condemn the avodo zarah, but he do not keep any other mitzovets , then “ what is the benefits of his genuine belief and what are the consequences of not following the mitzovets”.?. “Is there any benefits of his genuine belief?.” “Will he have any portion in olam haba?.”.
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A non-Jew who keeps the seven Noahide laws because they were commanded by Moses has a share in the world to come. As a non-Jew, he is not commanded to keep the other mitzvot.
Source: Maimonides, Mishneh Torah, Laws of Kings (Hilkhot Melakhim) 8:11.
If someone believes the Torah is the word of God, and believes he will be punished for violating it, yet he keeps nothing, then his actions contradict his stated beliefs. His beliefs are not genuine, they have no benefit, and he will not get any Olam Haba for them.