Rom. 4, 12

In Rom. 4, 12, do the two articles 'tois', coordinated by 'alla kai' refer
to the same group/persons (i.e. the Jews who are circumcised and who have
the faith that Abraham had...), or to two different groups, according to
most grammars?

Working on that passage with my students, I saw that the understanding of
the passage remained difficult.
Many thanks for comments.

Bernard Coulie 
Universite catholique de Louvain
Oriental Institute