Romans 4:14-25
14 For if those who are of the Law are heirs, faith is made void and the promise is nullified; 15 for the Law brings about wrath, but where there is no law, neither is there violation. 16 For this reason it is by faith, that it might be in accordance with grace, in order that the promise may be certain to all the descendants, not only to those who are of the Law, but also to those who are of the faith of Abraham, who is the father of us all, 17(as it is written, "A father of many nations have I made you") in the sight of Him whom he believed, even God, who gives life to the dead and calls into being that which does not exist. 18 In hope against hope he believed, in order that he might become a father of many nations, according to that which had been spoken, "So shall your descendants be." 19 And without becoming weak in faith he contemplated his own body, now as good as dead since he was about a hundred years old, and the deadness of Sarah's womb; 20 yet, with respect to the promise of God, he did not waver in unbelief, but grew strong in faith, giving glory to God, 21 and being fully assured that what He had promised, He was able also to perform. 22 Therefore also it was reckoned to him as righteousness. 23 Now not for his sake only was it written, that it was reckoned to him, 24 but for our sake also, to whom it will be reckoned, as those who believe in Him who raised Jesus our Lord from the dead, 25 He who was delivered up because of our transgressions, and was raised because of our justification.
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Galatians 3:23-29
23 But before faith came, we were kept in custody under the law, being shut up to the faith which was later to be revealed. 24 Therefore the Law has become our tutor to lead us to Christ, that we may be justified by faith. 25 But now that faith has come, we are no longer under a tutor. 26 For you are all sons of God through faith in Christ Jesus. 27 For all of you who were baptized into Christ have clothed yourselves with Christ. 28 There is neither Jew nor Greek, there is neither slave nor free man, there is neither male nor female; for you are all one in Christ Jesus. 29 And if you belong to Christ, then you are Abraham's offspring, heirs according to promise.
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Keeping the Mosaic Law will not save anyone since we are saved by grace through faith apart from the law.
You are advocating a false gospel.