Whats the Differance between Holocaust Denial and Holocaust Doubt?

I DO NOT DENY THE HOLOCAUST!! It is ridiculous that i have to give that disclaimer, but if I don't I am labeled a racist. The problem is similar to religion, they both get special treatment, if you question either religion or the holocaust, you are evil, wrong, etc... It is almost as if they are above investigation, which is a little suspicious. I believe that the holocaust happened, but I don't think that the numbers are accurate. People just believe what they are told. Read the history books of Italy, and you will see what really happened. I find it disgusting that people use the holohoax as an attack on atheists, Hitler was christian, he used the bible as justification. It is almost like the term "reverse racism", which implies that all white people are normally racist.