 When he was about 100 years old, neither yet the deadness of Sarah's womb. He staggered not at the promise of God through unbelief, but was strong in faith, giving glory to God and being fully persuaded that what God had promised, he was able also to perform. Hallelujah. Now think about this. Abraham was not a Christian. Abraham didn't have the new covenant to look at. And he was considered a sinner at that time.