Tomorrow look for the announcement of a letter signed by 100 Muslim scholars and leaders denouncing the injustices of ISIS. Significantly, the letter is to be issued in Arabic as well as publicized in English. Though it will be important to see who the signers are and where they are from, the letter will likely create a strong Muslim voice for shared norms of justice. If religious beliefs matter in forming ISIS, then public theological arguments are needed to counter ISIS — and discourage would-be joiners across the Middle East and the West.