Since most of people in the world believe there is only one God,
in other word indirectly said:
"All of your God is fake except mine (religion)"
r u believe this concept will bring peace or the beginning of chaos teory?
It has nothing to do with the religion, but everything to do with the people who follow it.
I think it doesn't change much of it. Back when polytheism was all around, like in Ancient Greece, oracles and priests used the gods to serve their own purposes, seing signs in things. They could, this way, control a bit what was happening around them. It also helped waging wars. The homerian tales of the Trojan war tells of the three godesses who get mad and, in the end, are the beggining of all the mess.
Before, monotheism had started, but only in a specific population: the jews (who weren't called such these days...). They already believed in a single god a loooong time before anyone else. But they were also waging wars, stating things about their promised lands...
Later, christianism evolved from the jews and extended steadily to most of the western world. First they were persecuted, and later on they persecuted the others. A true despotism evolved, and crusades proved in the middle ages that they weren't joking about their "holy lands".
Now, islamists and their jihad are quite doing the same thing, a new crusade but the other way the first ones were done. And with the same fanatism in some cases.
So I guess this changed nothing. People still abuse religious beliefs to promote their own interests, and it remains a pretext to do all kind of dumb things that are so common to the human being.
Yes, some Romans also didn't like the idea of having many gods, or gods at all, as well for the Greeks.
The problems are always the work of a few power-thirsty people...
As long as people aren't willing to take into account another person's belief, there will always be discord. It's more the mentality that I'm right and you're wrong, and since you don't believe as I do, I'll do what I can to discredit you and make you the enemy.