I'm trying to figure out just what you are attempting to argue here. Are you suggesting that you think that it is "better" to believe in a god and an afterlife?
Don't strain yourself too much, I'll go ahead and reveal this hidden message.
Atheist worldview
Hitler kills 10 million people. The people who died just cease to be. All he has done is kill 10 million people that would have died anyway at some point. There is no judgement beyond this life for his actions and no possibility of continuation of life for them. Thus, all he has done is speed up the inevitable.
Christian worldview
Hitler kills 10 million people. The people who die must now be judged on whether they will spend eternity with God or eternal suffering for their lack of acceptance of Christ's sacrifice. Hitler will be judged based upon his actions and those he killed will be judged also. He has killed people who might have heard the Gospel of Christ later in their lives and come to salvation. Thus, he has condemned by his hand those people to spend eternity seperated from God.
Who cares in the first case, there is no true ramifications for people who die if you don't believe in an existance past this one. So they stop existing. So will everyone eventually. So what. This life is worthless in the long run, so who cares how it plays out.
In the second case, there are eternal consequences. Those who die will continue on based upon their own beliefs and anyone who murders has taken a life given by God and has potentially put them in danger of never having heard the Gospel and having the opportunity to spend eternity with God.
A serious order of magnitude in difference. In one case, Pac Man is killed by Inky, in the other case, someone is placed into eternity. Now why is it morally imperative that we are convinced that we are a Pac Man game, and why is it insulting and anger inducing to say that our actions have eternal consequences?