There are over TWO THOUSAND DIFFERENT BELIEF SYSTEMS, so they all think they are the one.
The existence of counterfeit religions does not negate the existence of true religion. In fact, if you think about it, a counterfeit implies that there is a real McCoy.
In the realm of natural theology, defined as the study of God through the light of natural reason, very few have arrived at sound conclusions other than Aristotle and his teacher Plato. Unfortunately most students of higher learning never get the opportunity to study the “Metaphysics” where Aristotle contemplates the attributes of God. It is truly a remarkable text.