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In the same way that we claim Jesus’ death as God’s progression for salvation, Abraham believed in God and his promises, although they would not have made fully evident until centuries later on the cross. God promised, and Abraham answered in faith, even during the trial of God asking him to sacrifice his son. This is the heart of the Christian faith. God promises to save us when we trust in Christ and take him at his word, just as Abraham did. We know in greater detail how God worked out his plan of grace in Christ. We have much less excuse for our unbelief.

Galatians 3:17-19
17 What I mean is this: The law, introduced 430 years later, does not set aside the covenant previously established by God and thus do away with the promise. 18 For if the inheritance depends on the law, then it no longer depends on the promise; but God in his grace gave it to Abraham through a promise.
19 Why, then, was the law given at all? It was added because of transgressions until the Seed to whom the promise referred had come. The law was given through angels and entrusted to a mediator.