I can only speak for myself, and this is the way I see it (but this is already Faith):
"God" is defined this way: the only one not caused by anything else.
So, if God is the only one not caused by anything, but simply cause of Himself, nobody can reach God, if He doesn't allow to be reached.
So, the only possibility for us to know something about God is that He deliberately decided to communicate Himself to us.
From this premises, it's clear that there can only be one real Religion, and that all the other ones are simply negations of some parts of the real one...
"God" is defined this way: the only one not caused by anything else.
So, if God is the only one not caused by anything, but simply cause of Himself, nobody can reach God, if He doesn't allow to be reached.
So, the only possibility for us to know something about God is that He deliberately decided to communicate Himself to us.
From this premises, it's clear that there can only be one real Religion, and that all the other ones are simply negations of some parts of the real one...