Justification & Baptism? (Romans 4:9-12)

After articulating his gospel centering on a righteousness from God through justification by faith in Jesus Christ alone, Paul has pointed us to Abraham and David as those who received the blessed status of justified by faith, apart from works, now he uses Abraham’s circumcision as further proof which will enable us to understand our baptism and how it relates to our justification

1. I.When was Abraham counted righteous?
2. When was Abraham circumcised?
3. How does this demonstrate Paul’s point that justification is not by works, but by faith alone?
4. How does baptism then function as a sign and seal today of righteousness received by faith?