According to the Bible, it's been calculated that "God" killed over 2 million people. How? He burned them, smote them, and plagued them. According to 2 Chr. 21: 14-19, God killed Jehoram by making his bowels fall out, and the 250 people burned to death for offering incense (Numbers 16:35). He killed Lot's wife for looking back, hung the 7 sons of Saul, the 15,000 people who complained in Numbers 16: 49. Let us not forget the 7 plagues he released upon Egypt, and the killing of the first born son of every house with lambs blood atop the door frame.
Stated in the Bible, the "Devil" was only calculated to kill 10 people, and that is in a bet against "God" in Job 1: 1-19 where Job's 7 sons and 3 daughters were killed in a test to show Job's faith.
Thus, after stating all this, if "God" existed, would he be the one to blame for putting the violent tyranny acts of war into man's mind? Could he be the one to blame for showing us that force will sometimes help you what you desire; as in "God's" case where it was disciplined followers.
of course. and not only through direct 'actions' as described above, and by inspiring such actions in 'his' followers, but also indirectly:
the patriarchy 'he' inspired also led our world to be populated by legions of males in power. as if that's not going to inspire bickering and violence.
Plain and simple:
No. "God" is not the cause of war.
Your question leads to so many possible answers. the question "does God cause wars?" implies that you are including what could be called holy wars. For your answer there are countless examples, the middle eastern conflict (i.e., Israel), Northern Ireland etc....
If you are to take the word of the bible literally then God blatantly supports genocide. The punishment for trespassing on one of the laws of the bible is invariably death. Maybe this is just yet another example of how the bible reflects the time and place that it was written in.