"He'll come back in the same way you have seen him go into heaven," and he returns as a boy (like my first draft)?
This seems fair. He ultimately came back and didn't come back to some other "me". The state he left in changed from man to boy but "same" is ambiguous wrt which verb is modifies
author of your verse was writing a prophecy during the Middle Ages and was trying to keep from being burned at the stake for heresy for suggesting that he will return but not in this dimension? It would still be factual to write he will return.
This seems like a falsehood. Granted, one brought about by extenuating circumstances. We might say well this is clerical error and not God's being non-factual, which dodges the culpability. A bargain between God & Satan where Satan does not know all the rules cannot be accounted for by misinterpretation or by human fallacy
