Christians: Would this be true?

You say that the only way you can go to heaven is by accepting Jesus, and if you don't you will burn in hell for eternity. So according to you all, almost all of the Jews that died horribly in the holocaust went to hell because they don't accept Jesus, even though they loved God and lived moral, selfless lives, but someone like Jeffery Dahmer, a serial killer and cannibal, would have gone to heaven because he converted before he died in prison? How is this even moral? How can you say that your "god" is a God of love? It's simply sick.