The Christian god has intentionally killed millions. How can he be justified as good?

Most Christians believe that their god is pure "love". Whenever he kills, where is the justification in that? Is it just because he kills SINNERS? "Sinners" are humans that he CREATED with sin. He didn't have to create sin or evil if he is an omnipotent all-loving god. So why did he? And why does he kills millions of people in the Bible; some even innocent? He slaughters children for the sins of their fathers. That does not sound like love. If he ADMITTED that he was a jealous blood-thirsty war god, then I wouldn't have any problem with it. It's HIS fault. But he doesn't admit to that. He is the LORD, the judgment, the LIGHT, the PERFECT god, and complete love. I just don't understand how he can claim all that when he has so much intentional blood and suffering on his hands. And how do Christians back it up? "The Bible says -such and such-...The Bible says -this and that-..." Really? Can't you just admit that your god has done very evil things that cannot be justified WITHOUT referring to the Bible (which is biased by the way because it supports the god that supposedly wrote it in his own words)