'Credited To Him' in the Bible

For what does the scripture say? "Abraham believed God, and it was credited to him as righteousness."

How then was it credited to him? Was he circumcised at the time, or not? No, he was not circumcised but uncircumcised!

But the statement it was credited to him was not written only for Abraham's sake,

Just as Abraham believed God, and it was credited to him as righteousness,