If we think we know what happens after death it's a lot easier to accept it, humans fear ignorance. We hate not knowing the why's and how's of the world around us.
When some say "faith" i think they sometimes mean "hope." Think about it. Most people accept a religion without any real reason to accept other than what others have told them is supposedly the truth. And all of this is nothing more than a way to explan what happens after death... which we still do not know.
So why fear it at all?