I'm assuming the "waking up crying" bit refers to waking up as a newborn baby after you die. As others have mentioned, there is no proof. No one has spoken up to can say that they've been reincarnated AND given solid evidence that that is exactly what had occurred.
Not one of us knows what it is like to cease to exist. Trying to come up with an explanation for such things or believing another individual's explanation for such things gives others comfort simply because the unknown can be frightening.
Once you have proof that something exists whatever that may be, gives us peace of mind, because it?s like ?ok I understand. Makes sense, I can deal with it.?
Bringing ?faith? and ?god? into the picture when trying to explain what happens after we die is still, no matter how you look at it, an attempt to explain something we have no knowledge of whatsoever. All we know of death is that it happens. We decompose, and become the matter that makes up the earth.
-Doodle-V of the "Just passing through" class