en_tn/rom/04/11.md

a seal of the righteousness that he had by faith while he was still uncircumcised

Here "righteousness of the faith" means that God considered him to be righteous. Alternate translation: "a visible sign that God considered him righteous because he had believed in God before he was circumcised" (See: rc://en/ta/man/translate/figs-explicit)

so that righteousness would be counted to them

You can translate this in an active form. Alternate translation: "so that God will consider them righteous" (See: rc://en/ta/man/translate/figs-activepassive)