The problem with riddles is that we can't hide the answer.
I can give it to you in Morse code but you'll have to trust me that I got it right. It's three dots and a dash (...-)
A riddle, I am in heaven but not in hell. I’m in the devil but not in god. I’m in the river but not in the sea. What am I?
What are you? I don't know actually, but you seem to be confused !!!