This is a part of revealed religions that puzzles me a bit.
At first glance at least there seems to be a contradiction between their certainty that God exists and is able and willing to gift literal words to humanity and expect them to be taken to heart and the plain fact that, supposedly against God's will, such revelations are overall rather unconvincing and very much at odds with each other.
It is often challenge enough to get people who agree on the legitimacy of any given revelation to be on good speaking terms with each other. To me at least that does not hint of a creator of all things backing up any such revelation.
The way I look at both of these, Luis, is one and the same: God is the Source of all Truth and Wisdom, Revelation, Inspiration, and His Basic Message for all people, all time, throughout every culture, religion, and nation, I am convinced, is but one and the same: be devout, live righteously. That's what is truly important, that is a universal thing. Also, the questions which many, if not all, religions try to answer (and even, scientists, too). Even so, it's all rooted in one thing: that desire to make sense out of our universe and our place in it, those fundamentally, universal questions. It's not a Christian thing, or a Muslim thing, or a Hindu thing, or a Buddhist thing, or a Pagan thing, or a Non-theist thing. That’s a human thing! The fact that they differ, that too, is The Creator's doing, as is diversity period. That's a very beautiful thing! What is NOT His Doing, however, is that human beings struggle and fight over those differences, seeing them as indications of a fundamental difference between them, when in all honesty, THEY ARE NOT. Those differences clearly exist, but their purpose for existing, what many, if not all, are built on is truly one and the same. Different ways of expressing what's really that same desire. Am I telling a lie?
Even if I somehow believed in a Creator God, I would have to accept that he does not much want to manifest himself through prophets and scriptures - because if he did, well, we would know it instead of hearing why we are expected to believe that it is so.
That is why the independent investigation of Truth (which is, coincidentally, a bedrock principle in my faith) exists. No one is forcing you to accept anything that you don't want to accept. I'm surely not. People who believe in God, and Revelation, and other such things as these, some do so because of family and society, what they're told, but others do the seeking independently. If something makes sense to them, if it strikes a chord deep within them, they will believe it, if not, then no. Either way, all is well.