True Believers

My mother once told me that if you believe in something strongly enough that it will manifest itself. Einstein said that everything is relative from one's own point of view, i.e. the light reaching my eye is not the same light as the person standing right next to me. We also have learned that as far as we know we cannot destroy matter only change it's form.
What are the ramifications of this knowledge as pertains the current world situation? Many as I see it! If everything is relative and belief can bring on manifestations. Why wouldn't anyone with strong beliefs not follow those beliefs to any one or many conclusions. Scary and yet beautiful. A belief system can be both. The only problem is the belief systems come into conflict and then we have the current world conflicts! One may assume that maybe belief systems are bad judging from the results of these conflicting belief systems. But maybe it's not the beliefs that are the problem but the conflict itself.
We all understand or should understand that the universe controls our destiny as we are, for all practical purposes, made up of the universal elements. Our very atomic structure is universal. So why not look to the universe for the answers to the aforementioned conflict. How does the universe deal with conflict? The answer is devastating, both conflicting entities are destroyed and since matter cannot be destroyed the destroyed entities then merge into one larger entity due to the gravitational forces of the whole mass.
Are we as human beings as smart as we think we are any different?
TIC