Hitler was not really a Christian so stop using him in your arguments. As for your assumptions about those who are going to hell. Well you are absolutely correct. If they deny Jesus their is no hope for them, sad to say.
Deny Jesus as what? I don't deny there was a guy running around Judea circa 1st century AD who started an offshoot of Judaism that preached love and peace and then got the cross from some uptight Romans and politically motivated rabbis. It's the 'son of God' business that I'm skeptical about.