Original sentence: There have been attacks against Arabs and Iranians not only on the basis of their religion (Islam), but on the basis of their ethnicity because numerous Christian Arabs and Iranians also been racially attacked
Edited sentence: There have been attacks against Arabs and Iranians not only on the basis of their religion (Islam), but more importantly on their ethnicity because numerous Christian Arabs and Iranians also been racially attacked.This includes the burning of a Arab Christian Church in Los Altos, California after September 11 which was owned by local Palestinian Christian congregation