It’s a belief shared by many, if not most Christians.
Are you a Christian? If so, does your church have a statement of beliefs or Confession - Augsburg, Westminster...? If so, there’s a teaching on it.
Never heard of such a thing. I’m a P.K. and spent my college years in Seminary. What is it and what is the doctrine behind it? Is it Biblical or something “made up”?
I guess it doesn’t matter.