Righteousness is for all who have faith in God. Romans 4:9-12 talks about the fact Abraham was saved by faith and not by adherence to the law. Circumcised vs uncircumcised was merely a seal of the righteousness he had by faith. Again, Abraham was saved by faith not by works.
I'm not going to stress myself out with trying to write a long explanation of the text I read. I really just want to get back to reading.