Can you imagine a world without free will?
Too complicated. To begin with, what is 'free will?' We all act in accordance with our inherited characteristics, and we are products of our environments and the societal norms of our time.
Everything we do, every decision we make, is based on these concepts, along with the materials available to us.
If we had been born in the fifteenth century, our views on religion would have been more firmly entrenched in our belief system, because that was an expectation of that particular society.
Now, we live in an environment where questioning is thought to be a good principle, instead of blind obedience to authority, namely the church.
I don't think God, or any power which goes by that name, is responsible for wars.
Wars are a struggle for money and power, and always have been. That's because as humans, we are hard wired to yearn for these things.
For instance, when someone says of another person, 'Hasn't he done well?' the implication is always of having amassed money or power. It very rarely means, 'he's kind, or generous, or good looking, etc.
That's my view anyway. Sorry for the rant.