What does Romans 4:20 mean?
Abraham waited many, many years for God to keep His promise to give Abraham and Sarah a son. That promise wasn't given until Abraham was more than 75 years old, and wasn't fulfilled until Abraham was 100, some 25 years later! Paul wrote in the previous verse that Abraham's faith did not weaken. He held fast to his faith, even long after the hope of having a natural-born son became impossible according to human experience. Now, Paul writes that Abraham experienced no unbelief. He didn't waver in trusting God. Just the opposite: He grew stronger in his faith and continued to give glory to God.Abraham's faith was undeniably remarkable. He was far from a perfect man. Abraham sinned, as all do. But He believed that the God who spoke to Him would do exactly what He promised even as year after year passed without that promise being fulfilled.