All these religious cults believe that their one is "the correct one". They all know they are the correct one because they all feel it with 100% certainty in their heart.

Unfortunately anyone with an ounce of common sense can quite clearly see that they cannot all be correct. Yet everyone "knows" deep deep down in their heart they have the "correct one".

Conclusion:
Knowing it in your heart you've picked the right one is clearly a totally useless indicator and has no value whatsoever.