Not a trick question - I'm being sincere. Me and the guy who hooked up my Verizon Fios were talking about this.
I was telling him that I'm just agnostic - I don't believe everything came from nothing but at the same time I'm not at all Religious.
He began to get into the Forgiveness thing.
I was like - well, I do my best (and even when noone's looking) to be a good person.....but if I continue down that path and can never get over the mental block of not having "faith," then I guess I'm doomed eh?
But the mental block won't ever go away. I know this because I know myself. I'd have to see some sort of miracle, and be able to somehow attribute that miracle to a Religion or whatever. I don't see this happening. How do you "just know?"
For me, "you don't."
I'm sure it's different for others.
Your opening post isn't what I was expecting when I read the title but I think my original thought as to what it meant can help to answer a little bit....
I thought the question was meant to ask, "How do you explain instinct?"
It made me think of a deer, when I'm out hunting.
I'm sitting in a tree with my rifle against my shoulder. I haven't made a noise or even so much as taken a breath out of anticipation.
The wind hasn't changed and this big buck isn't looking my direction.
All of a sudden his ears perk up and ZOOM!! he's off like a rabbit!!
We always call it 'instinct', right?
I call it 'God's whisper'.
Ya ever get that feeling, sometimes, like you shouldn't be somewhere so you leave and find out later that (for instance) a car swerved up on to that curb shortly after you left....or something similar????
Again, 'God's whisper'.
That's how you "just know" when something isn't right, or that you should do something, or that you shouldn't be doing what you're doing.
So, as an agnostic, you might call it instinct or conscience.
I call it God's voice!!
When you start to call it what it is, you'll more easily recognize it for what it is when you hear it.