I assumed I would be someplace different in my life years ago. Boy did that turn out bad. Why did I assume that? Had little to do with reality and much to do with what I wanted reality to be. I woke up from something of a nightmare 30 minutes ago in that regard. So it's a rather fresh thing yet. The point is, you make your assumptions based on what you want your outcome to be most likely. Else, why would you view any other similar assumption less valid. You don't look at a wrecked car and assume it came from the factory that way. You don't look at an adult human at all 7'4" of basketball player and assume they just popped out of momma that way.
When people have preconcieved notions, they tend to buttress them - not tear them down. When they've buttressed them for so long as to come to depend upon them... realizing the truth is anathema. It's too shattering to let go of.. and some don't - even to the point of madness. And there you are, not mad; but, propping up one assumption with another because of what you'd like to be the case. Else, any assumption regardless of the label going with it would be equally as valid. It just isn't valid in light of what you'd like to be the case. In which case, your priorities on the matter are exposed.
As far as the relationship of energy, matter and time at the creation, babies become men and women. What were energy, matter and time when they were born? Try thinking in the abstract a bit more. I've just asked a question I've never before in my life heard expressed. But, I'm sure it can't be a new question. Someone has asked it before somewhere. Why do you presuppose they sprang from the womb fully formed?