A sincere atheist may find answer to why God fought wars in which many people young and old perished.
First of all the supposition of a God derives from human inner will of paternership. Now if any God we chose is our father, that means the essence of life, we must also be willing to ACCEPT that he fathered us for a PURPOSE. That purpose may justify all the actions he(the father) undertakes. So, from the point of view of a Jah worshiper my explaination to those acts that people rationally and simplistically humanly judge unacceptable (though too surrealistic) is: Jah created the earth to be inhabited the way he was thinking best by men he had created. Those men mistakenly failed to measure up to that purpose. Jah decided to give them a CHANCE, and Adam and Eve were allowed to "fill the world", still Adam's progeny had no idea of THE PURPOSE, for which they went against. Jah gave them a second CHANCE, by the means of the SEED of Abraham, a man he chose to take the lead in the PURPOSE, to enlight the rest of mankind and later extrapolate it to a nation whose LAWS (Mose's) influenced many constitutions of our days. Now in the establishment of the Nation, which was part of a plan, people residing those places were warned not to go against the plan, which they did and faced the consequences. A war was launched and women were killed and children too but this was collateral and God new why it was necessary in his capacity of omniscience. Once the nation was no more, Jah established christianity through Jesus, a man he sent to TEACH and expand the plan/PURPOSE to the entire GLOBE. The man was killed, not by God but by the Romans. If he wouldn't have been killed or hypothetically accepted, that would have been the shortcut leading the PURPOSE. Now that he was killed, Jah turned the value of his blood into sacrificial gift for atonment of the now to do sins. That is why the man is a GIFT to you and me. For those who do not believe in God, know that you are in disadvantage for there is No MORE CHANCE, there will not be no MORE Jesus. It is closed. Those who follow Jesus and his teachings have the advantage of avoiding destruction (their children included) if they do not leave by his standard. To add, if ever God didn't exist (for the doubters) they have nothing to lose. That is how I realy am a not doubting JAHTheist. THE PLAN continues and we are its last phase, Please wake up!! We are not trees!!