Hm, you have never read the old testament, have you?
To give you just 4 examples of many:
God kills:
And there came out a fire from the LORD, and consumed the two hundred and fifty men that offered incense." (Numbers 16:35)
"And it came to pass, that at midnight the LORD smote all the firstborn in the land of Egypt, from the firstborn of Pharaoh that sat on his throne unto the firstborn of the captive that was in the dungeon; and all the firstborn of cattle. And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead."(Exodus 12:29-30)
God orders Killings:
"And Israel joined himself unto Baalpeor: and the anger of the LORD was kindled against Israel. And the LORD said unto Moses, 'Take all the heads of the people and hang them up before the LORD against the sun, that the fierce anger of the LORD may be turned away from Israel.'" (Numbers 25:3-4)
"Thus saith the LORD of hosts, I remember that which Amalek did to Israel, how he laid wait for him in the way, when he came up from Egypt. Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ass." (I Samuel 15:2-3)
You are not satisfied and want more examples? Well, just open the bible, especially the old testament is full of such things where god orders killings of kills people with his own powers ;)