Farkel, I used to think the same exact way that you do and can really relate.
1. If you were to be presented with undeniable scientific and historical evidence and still choose to ignore it, that would just be intellectually dishonest. If you have a pre decided bias, that would go against the scientific method and any objective thinking.
2. Regarding God being a Murder... First your numbers of "Millions and Millions" is not accurate for representing the occasions when God commissioned His people to carry out judgment on corrupt and degenerate heathen nations through the profits of Israel in the Old testament. Only under extreme conditions was a war ever sanctioned and not after many years of warnings. God does not like the death of anyone but life and preservation of good from the destruction and corruption of evil. The wicked and corrupt people who would have destroyed and pillaged any and all law abiding citizens remaining in the world, the very ones with any good or preservation of morality remaining. God said he would spare a city if their was just one righteous man. So let us be that one righteous man. I would have to argue that a God that was not just and who would let such wickedness and suffering triumph over love, kindness and morality would be a God who did not care about us.
We know that war is the result of sin(or what you may define as evil in your own terms) and that it is essentially wrong or evil, but what should be our response when a nation like Germany (in WWII) rapes, pillages, and plunders another nation for profit or genocide? I think that Gleason L. Archer expresses the argument well:
"How could God be called 'good' if He forbade His people to protect their wives from ravishment and strangulation by drunken marauders, or to resist invaders who have come to pick up their children and dash out their brains against the wall? No policy would give freer rein to wickedness and crime than a complete surrender of the right of self-defense on the part of the law-abiding members of society. No more effective way of promoting the cause of Satan and the powers of hell could be devised than depriving law-abiding citizens of all right of self-defense. It is hard to imagine how any deity could be thought 'good' who would ordain such a policy of supine surrender to evil as that advocated by pacifism. All possibility of an ordered society would be removed on the abolition of any sort of police force. No nation could retain its liberty or preserve the lives of its citizens if it were prevented from maintaining any sort of army for its defense. It is therefore incumbent on a 'good God' to include the right of self-defense as the prerogative of His people. He would not be good at all if He were to turn the world over to the horrors of unbridled cruelty perpetrated by violent and bloody criminals or the unchecked aggression of invading armies."