I said the same thing as Knap a few months ago. The violence will always exist in humanity.
This might be a logical fallacy, but here goes.
By that same logic
Humans are responsible for creating all religions
Religions are the cause of some human conflicts
Therefore, Humans are the cause of all religious conflicts
Once you've said that, there's really nothing left.
That's the way I look at it anyhow. If you were to completely remove religion it might make a difference in our lifetimes and the lifetimes of the next few generations, but in the grand scheme of things it won't make a difference. If you could take a look at the issue from earth's lifetime the amount of violence in the world wouldn't change. That's because religion is just one excuse used by humans to commit atrocities, and if it weren't religion it'd be something else.
Nothing. It's a sad reality, but all of the actions you can take to try and change the world are worthless. I could sit here forever and try to convince people to believe what I believe all day, and to some degree I do, but it's pointless. The world seems to do an eternal balancing act. If you eliminated religion, something would replace it. The most prominent candidate to me is naturalism, or something like that. I know I always feel spiritually rejuvenated when I go to the zoo, golfing, walking, etc. Eventually, people would create a doctrine and follow it to the T. It would be a religion of sorts and people would go to war on both sides. It's fun to debate things like this, and it has certainly altered my life in some way, but it's pointless on an even larger scale. It's like thorns crackling in a fire. It doesn't mean a thing.