I use the word in the restricted sense of "Islam as taught by Muhammad." If you take Islam to mean belief in one God and virtuous conduct in life, you may say that there has not been and will never be any true religion besides Islam. In this sense Islam is the only true religion. See p. 27, last para. of Note 2 p. 19, and of this Note pp. 33, 34.
"A man must not do reverence to his own sect or disparage that of another man without reason. Deprecation should be for specific reasons only, because the sects of other people all deserve reverence for one reason or other. By thus acting, a man exalts his own sect, and at the same time does service to the sects of other people. By acting contrariwise, a man hurts his own sect and does disservice to the sects of other people."—King Asoka's Edict XII.
"Every sect favourably regards him who is faithful to its precepts, and, in truth, he is to be commended."—Akbar, (Ain Akbari III).
See p. 55.
Muslim = resigned and submissive, therefore, peaceful.