Original question: "how do you know your religion is the "right" one?"
Answer: "by waiting until you die."
Options: -
(a) Nothing happens at death. Blackness. You are non-existent. You really die. Like being anaesthetised in an operation. ETERNAL BLACKOUT. Interpretation: religious people were conning you all along, just to get your money and to control you.
(b) You go to heaven.
(b1) The people in heaven are your religious mates. Fine - your religion was the correct one.
(b2) Strange people in heaven. Your religion was wrong, or maybe you were a dmn atheist/agnostic, but you were a very nice guy/chick, like the thief on the cross next to Jesus.
(b3) Everybody is in heaven. Hitler, Idi Amin, Foday Sankoh, Mashada tribalists, Pol Pot, George W Bush, Matheri, Inspecteur Clouseau!!! All religions were the right one. God is the father of all and loves all his children. Even human parents visit their criminal children in jail, so who is God to send any baby to hell!!!
(c) You find yourself roasting but you never burn up (laws of physics suspended), never go into shock, never get used to the environment, never lose your voice or your mind (psychology laws also suspended). The place is full of sexy horny people, thieves, liars, adulterers, murderers who can't murder.
Interpretation: you're still a member of that religion.