I don't know what anyone is getting all upset about, subjective to their claimed perspectives.
Christian: What Christians are told is not precisely "not to judge", but to not judge with an uneven measure. That is to say, the standards we hold others to sure better be exactingly met by ourselves, or there may very well be "hell to pay." The idea that we're not to appraise anything is just absurd. And while it's true that it is presumptuous of anyone to pretend to know what any given person's final end will be, it is equally stupid to pretend anyone dying without faith will be saved in that condition. "Without faith it is impossible to please God." Further, the Scriptures reflect what at first may seem to be an unsettling idea - that the Saints will rejoice when God issues His sentence, both giving reward to the elect and casting those "not in the book of life" out of the Heavenly City. The meaning? That those who will end up in the "lake of fire" deserve to be there - and if we have a hard time seeing this now, it is only because our priorities are confused and we are not seeing things for what they are in relation to God.
Atheist: Hell apparently doesn't exist anyway. So other than lamenting over the mental illness of people who believe in such places, you really shouldn't care either way. After all, couldn't someone else just say "those who are not Odin's sons aren't going to Vahalla" or what have you? I mean, it's all the same gibberish when it comes down right to it, as are all beliefs. In the end, you should care about your implied exclusion from God's friendship about as much as I would my implied exclusion from the fold of Rabbinical Judaism or it's version of "the world to come", or Islam's "Janna", for being the filthy wine swilling, bacon eating, cross worshipping kaffir that I am.