You're completely correct with regards to the new covenant and fulfillment through Christ. But you're attempting to say without saying it, that the first covenant becomes null and void UNLESS you believe in Christ.
Sorry, that's just not in the bible at all.
The New Covenant ADDS to the glory of God and subtracts nothing including nothing about the first covenant.
The reason you wont say it is because it reveals the inconsistency in what you are saying, that God really didn't mean the first covenant he made with the Israelites, i.e. the nation of the Hebrews of that time. Which of course conflicts with other things you say about God not lying and God upholding His covenants.
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