Hitler wasn't a Christian or an atheist. He was a politician. And euphorics have clearly never heard about Hitler's
Table Talk. Anyway, even if Hitler really did self-identify as an orthodox Christian, the argument is irrelevant because it takes more than just self-profession to define one's personal identity, especially with this kind of thing.
Here's a good article I found on Hitler's religious/nonreligious beliefs. It contains a lot of notable quotes from
Table Talk which seems to showcase Hitler's rampant anti-religious (and even non-atheistic) views very well.
Funny side-note -- the base website is called "kiwicatholic.com":
http://homepages.paradise.net.nz/mischedj/ca_hitler.html
@c-no Is this the quote you were thinking of? There are many like it:
"Our epoch in the next 200 years will certainly see the end of the disease of Christianity. It will last another hundred years, two hundred years perhaps. My regret will have been that I couldn't... behold <its demise>."