Well, since you are inviting me to rejoin your thread, I will.
Of course I don't know your relationship. That is why I went strictly on what you said you told him. And I simply asked if you might not have done better to tell him the true reason God said in Genesis 3:22 that He was putting them out of the garden.
And, does it not seem to be confusing to tell him, on the one hand, that God will leave him (separate from him) if he does wrong, then hope to reverse that erroneous statement by telling him that "Even though we all make mistakes, we are still loved to pieces."? ("I love you, but I will turn my back on you if you make a mistake." is really what we are communicating.)
Just about every single one of us on this forum expresses regret that we were victims of sometimes a lot of very confusing "teaching" as a child that left us having to untangle a mess of conflicting notions.
All I was ever saying is to make sure we don't do that to our own children.... giving them the same problems with understanding God that many of us grew up with.