Therefore, the promise is based on faith so that it can be a gift. Consequently, the promise is guaranteed for every descendant, not only for those who are descendants by obeying Moses' Teachings but also for those who are descendants by believing as Abraham did. He is the father of all of us,
as Scripture says: "I have made you a father of many nations." Abraham believed when he stood in the presence of the God who gives life to dead people and calls into existence things that don't even exist.
When there was nothing left to hope for, Abraham still hoped and believed. As a result, he became a father of many nations, as he had been told: "That is how many descendants you will have."
Abraham didn't weaken. Through faith he regarded the facts: His body was already as good as dead now that he was about a hundred years old, and Sarah was unable to have children.
He didn't doubt God's promise out of a lack of faith. Instead, giving honor to God [for the promise], he became strong because of faith
and was absolutely confident that God would do what he promised.
That is why his faith was regarded as God's approval of him.
But the words "his faith was regarded as God's approval of him" were written not only for him
but also for us. Our faith will be regarded as God's approval of us who believe in the one who brought Jesus, our Lord, back to life.
Jesus, our Lord, was handed over to death because of our failures and was brought back to life so that we could receive God's approval.