Was Hitler a Christian?

That’s true of any historical document; it doesn’t imply that what Hitler said about Christianity should be rejected. Kershaw’s wording in its context (which you omitted somewhat) is notable; he says that even the table talk monologues should be treated with due caution, suggesting a level of reliability that is superior to other sources.

A respected historian? I mentioned how he wasn’t so reputable in post #110 and explained why in post #34.