The holy quran. as per statistics , muslims are second largest religion in world.
but to me it is teh biggest religion , as we do not have following and practising muslims , but all are under one umbrella muslims.
unlike us , the xians are divided in various sects , like some are followers of jesus , some call him god , some call him son of , some call him the spirit and they are confused. no chris tian can give a straight reply to this.
more than 1 million have by hearted the holy quran and billions read phrases of holy quran every day five times in salah and also billions recite everyday