Oouf that was a heavy conversation!
I am not able to give you an answer how do I know what is right or wrong cause I don’t actually know it. But something inside of me when being absolutely present does .
When it comes to the conversations like that, religion or spiritual stuff, I feel like heads are so limited. Once I had a very long conversation with two hardcore Christians and the usual ‘ there is only one way’. There was no budging either way. So at some point I took their hands ( probably couldn’t do that with the stranger 
) and started talking about the present, bringing them in there and after few minutes they started crying.
Since that experience I stopped talking that much about religion, their differences etc. And if the conversation comes I tend to steer towards the present moment, and that’s where people can find their answers I believe.