What religion are you, and how do you know that one is truth?

Please do not just claim that it feels right. Every religion feels right to the people in it.
I mean, what proved to you that this is the one, true, guaranteed, truth?
An example of this is….
Muslims and Catholics are do not agree, and are opposites on several things, but both have people that believe in their religion so much that that will kill, and die for it. Both can not be true, so at least one, possibly both, feel right, but are not right.
Disregarding the "feeling right" what proof do you have that your religion is the truth?

Any religion – it is the opium for the people.
People by nature of the soul – egoists. Everybody wants to live forever.
Having something if not here, but at least somewhere after.
Those men of genius, who came first thought of to create a paradise in heavens and hell under the earth, in fact, nothing particularly clever not invented. They just gave people something that people yearn for. And people want – immortality. And they – got this. At least in the form of faith in this beautiful nonsense. People do not want ugly truth. They want a fairy tale.

Sparks from the fire, too, might wants to be eternal. But it goes into nothingness under the pressure of imminent rule: "Nothing is eternal under the Moon."

Nothing is eternal under the Moon
and nothing new.
And everything associated with you,
just word – a moment of the toon.