Try to imagine this: Person A is talking to you about beliefs and is telling you they know person B, not present, who is in possession of the absolute truth. They do not say this mockingly but in dead earnest. And they are talking about another person, a normal flesh and blood human being. "That person really knows what made everything and whats right, whats wrong and why things are as they are and what each of us must do". And you ask person A "What about you? What do you believe? Can you share some of these truths you heard from person B?" And all you can really get out of person A is "I'm not so sure what I believe or I can't be sure its right"
The grating nonsequitor should give you the creeps.
Relax, you are never going to have this experience. We don't work that way. When somebody human posseses the absolute, devine and complete knowledge, that someone has to be YOU. If you become convinced that you are in the company of some other person so endowed then you too cease to have doubt and possess ultimate truth by proxy. But notice, the person with no doubt is still YOU. When you eventually discover there are other sects, there are people who have goofy fairy tales of supernatural elevation of THIER beliefs to dominence then you will go one of two ways. One is more or less "Oh! I get it! We all need to make up these stories. I wonder what's behind all that if we ALL do it?" The other is more or less to buy amunintion, line your basement with canned food and carefully test the purity of thought of those in whom you confide, sometimes appointing others the job of straightening out any starved mind who can be safely introduced to the real truth. For the simpler packagings of faith, relativism really is deadly dangerous company.
To feel that you have come to know the ABSOLUTE and sole set of truths upon which the world is founded amounts to worshiping yourself.