Another question that could possibly arise is the circumcision question. For the Judeans, circumcision is the sign of the covenant with Abraham, but what about the Gentiles (non-Jews)? Turns out that circumcision is actually a non-factor in receiving God's blessing.
Let's go back to the Abraham example, where "faith was accounted to Abraham for righteousness" (4:9). However, notice that the faith event happened "not while circumcised, but while uncircumcised" (4:10). So the faith plan applies to anyone regardless of circumcision status.
Additionally, Paul describes circumcision as a sign that is "a seal of the righteousness of the faith" (4:11), and historically, the circumcision was used to denote and set apart the Jewish group -- the group that would later have an offspring known as Jesus. But the sign was given before Abraham was circumcised.
Abraham is considered "the father of all those who believe" (4:11) -- circumcised or uncircumcised. Even though some people may be uncircumcised, they can still benefit from the imputed righteousness -- just like Abraham. Abraham is also the father of the uncircumcised who "walk in the steps of the faith" (4:12).
The blessings of faith are open to everyone -- not just the people who were circumcised.