That is what the Scriptures mean when God told him, "I have made you the father of many nations." This happened because Abraham believed in the God who brings the dead back to life and who brings into existence what didn't exist before.Romans 4:17(NLT)
Abraham is often referred to as the father of faith, because the Lord used His trust in God's promises as the foundational example of a man who is credited with the righteousness of Christ - by grace, through faith. Among other things God appointed Abraham as the father of many nations - the spiritual father of both believing Jews and believing Gentiles.
But Abraham is one of many men and women of faith.. who believed God's promises and took Him at His word. And Paul explains WHO this great God of Abraham is.. He is the God Who brings the dead back to life. He is the Lord, Who creates things out of nothing. He is the God Who raised Christ from the dead and He is the Lord, Who give those who are dead in trespasses and sins a new life in Christ; eternal life in Him and life more abundantly - by grace, through faith.
Abraham was justified by God's grace.. because He simply believed God's Word. He was not justified by keeping the works of the Law - for the Law of Moses was not yet given to his descendents. The Law was not given to save men but to point them to the Saviour of men, and like Abraham we are not saved by keeping the works of the Law.. but by grace through faith in Christ.
And the righteousness of God is extended by grace, to all who believe in God - both Jew and Gentile, for Abraham became the spiritual father of many nations as well as the physical forefather of God's chosen nation, Israel.
That is what Scriptures means when God told Abraham, 'I have made you the father of many nations.' He did this because Abraham believed in God and trusted His word - the One and Only God.. Who brings the dead back to life and Who creates new things out of nothing. Praise His holy name.
Heavenly Father, how I praise Your name that You have made me a new creation in Christ and have credited me with Your righteousness, by grace through faith in the Lord Jesus Christ. Thank You that although I was dead in trespasses and sins You have breathed Your new life in Christ into my body, and made me Your child for ever and ever. Thank You in Jesus name, AMEN.