Many are unclear because they leave some aspects of their belief system to faith alone, or because of the way in which these beliefs developed. It is more likely that they will be unclear if they developed over a long time rather than being based on the teaching of one individual.
Some religions are ambiguous and unclear precisely in order to give them a wide latitude in the beliefs and practices they accommodate. Often such religions deliberately formulate doctrinal statements that are vague so that persons who understand the statements in highly divergent ways can be united.
Taoism and Shinto are the most ambiguous religions I present in my world religions class, and neither rely on historical narrative. Historical narrative adds at least a minimum of concreteness.
Faith and religion are personal and individuals are free to choose the decrees of the religion they want to practice. However, the choice of religion very often is predetermined and one has no choice but to follow the religion of his/her parents. Sometimes, as you have rightly observed, the religious laws are ambiguous, or at least we feel they are. I think that a religion and its laws must agree with the principles of logical reasoning. Leaving the practical imports of religious beliefs to speculation or basing them on untenable historical narratives renders the religion ineffective and defies the prowesses of logical mind.
A religion may start off crystal-clear, but once it drops into the reality of human diversity, it shatters into many pieces. Like the late Abraham Joshua Heschel once put it: "There is only one truth, but many ways of misunderstanding it." The hope is not that we can succeed in putting the pieces back together, but that instead of cutting ourselves and each other on the broken pieces that we can rather hold each fragment as a precious gem in its own right.
Many, if not most, religions arise out of an attempt to codify some group accepted experience of the numinous, whether by one individual or by a group of individuals with similar experiences. However, the problem arises in that the numinous is not and cannot be adequately described in human language. Thus all attempts to codify this experience will result in ambiguity.
Well, Religion, in its nature oscillates at the boarder between the known and the unknown, between the secular and the sacred; between the human and the divine. So it should not be a wonder if a religion sometimes casts on us its ray of vagueness or complexity. Something of Religion remains a mystery irrespective of man's claim to grasp its dynamics.
Religions are all the product of history created by man's need to invent ways and means to reach God in order to organize his spiritual life, and to use them to derive a sense of security and tranquility from the wrath of nature and the various fears of life, as well as the fears of punishment after death. Therefore, the reason for the difference of religions and their fragmentation into sects, is due to the fact that it is made by human beings and is not a status of God, which can never come down to incomplete, incomplete, ambiguous religions that can be interpreted, interpreted, studied, divided and divided.
I believe some - if not all - religions are ambiguous and uncertain precisely because they attempt to explain the nature of the divine and its relationship with humanity. Because this involves knowledge and concepts which is probably beyond our understanding or comprehension it is inevitable that our attempts to explain are uncertain.
جميع الاديان السماوية كاملة وواضحة ....لكن الانسان هو من يحاول تضليل طريقه والتحايل على فهمه لحكم الدين وبالتالي إضاعة الطريق على الكثير من الناس غير الفاهمين باتباعهم هذا الإنسان المشكك المتحايل.ولا اقول ذلك اجتهادا لدينا في الإسلام الدليل في سورة البقرة التي امر الله فيها ان تذبح بقرة نعم ان تذبح بقرة بهذه العبارة الواضحة .لكن مالذي فعلوه بدأوا بالتضليل والتحيير لاضاعة الطريق الواضح فسالو اوصافها ألوانها عمرها وكان الطلب واضحا .فالدين كامل اما المتبع فهو من يعمد الى التضليل واضاعة الطريق.
All religions are full and clear ... But the man is trying to mislead his way and circumvent his understanding of the rule of religion and thus wasting the way to many people who are not understanding by following this man questioning the fraud. I do not say that diligence in Islam evidence in Surat Baqarah which God In which to slaughter a cow yes to slaughter a cow with this clear statement. But what they did began to mislead and distort to lose the clear way Valsalo descriptions color old and the demand was clear. The full religion either is the one who deliberately mislead and waste the road.
One explanation: Some religions are more ambiguous and uncertain than others due to the question who is considered authorised to interpret its religious sources. A religion which is more based on a top-down approach, like the Catholic Church, is centralised in interpretation and therefore less ambiguous. Religions with more of a bottom-up approach, like Islam, Judaism (and to some extent even Protestantism) don't necessarily have a centralised exclusive authority for interpretation of religious sources, which allows more variety.