If i peed on a snail would it kill it

because of the salt and want not

Might not make it feel too good. Probably would just make the poor bug stink.
Have you been wandering around and tinkling on unsuspecting insects?
You know, insects urinate on you, too. When you sleep. No, really.
They eat our skin, drink our sweat. Heck, I imagine that some would even drink wee!

LOL I don't think so... snails do live on moisture!