It isn't difficult to tell the truth, but it is incredibly difficult to explain why you lied to your child. Most kids are resilient and can come out just fine after being lied to for years... however, it doesn't make bearing false witness acceptable.
I don't even know what you're objecting to about what I've said... Do you think it's wrong to tell your children the truth but to go ahead and pretend? What is to disagree with me about?
I think I just don't like you. I think you think you know things that you don't have a clue about. That makes you even more dangerous. Go educate yourself before you screw up your own kids.