Holiness vs Fanaticism

Question: Where to draw the line between dedication to holiness and religious fanaticism (in light of the cowardly terrorist activity since 9/11?

What is holiness? What is religious fanaticism?
Holiness is a measurement of a person’s divine nature. How godly a person are they? Understanding what holiness is, requires an understanding of what divine identity is defined. If the divine being is a loving identity, holiness is a measurement of one’s loving nature. If the divine being is a wrathful God, who will destroy any opposition, then holiness is a measurement of one’s triumphs over any opposing ideas or definitions.
Religious fanaticism is an intolerance of any religious beliefs that do not fully align with our own. This covers every religious belief from the far left to the far right, if the person is avidly intolerant of any religious belief, other than their own.
In ancient times this was only a problem when two religious ideas crossed paths. The world’s societies or cultures were divided by religious beliefs. A person’s neighbors were of the same faith as they. As populations grew and humanity became more mobile and urban, people found themselves with neighbors of different religious views.
These new neighborhoods of mixed views taxed the concept of holiness. If a person’s holiness was a measure of their love of their fellow beings, they would never attack anyone else’s beliefs. They would always forgive, while turning the other cheek. The classic example of this was killed by his neighbors. Any person who truly follows this way of holiness will always end up in some form of crucifixion, not triumph, on this Earth.
If a person’s holiness is to prove here on Earth that their religion or understanding of the divine is the one and only true one, they will always attack the beliefs of others. They will live by the sword and die by the sword. Their earthly triumphs are never permanent, because someone always eventually attacks and defeats them.
So is it futile? Where can we draw the line, so each can survive as neighbors? I am not sure any longer. I thought we could exist side by side, but the attackers don’t like to heard disagreeing ideas, no matter how philosophical it might be. So, may be we are headed back to the dark ages, when neighborhoods were divided over religious differences.
Perhaps we could let each group build a wall around their cities and allow no one but true believers into their particular neighborhood. Let them all sign a treaty that says they will keep their noses out of the business of the other cities and neighborhoods. I think its called isolationism.
Wait a minute, isn’t that what they are doing with the Gaza strip? North Korea? Saudi Arabia? and other places? It is even close to home, with the blossoming congregations in several religions. These growing groups are against anyone with different views. The people inside these movements usually don’t really know for sure what their religion is in truth, but they love the comfort of being surrounded with fellow believers. Just like living in a village around the castle with a king protecting you.
I guess the line to draw between dedication to holiness and religious fanaticism is a circle and allow in only people like me - And to Hell with the rest. Or forget any line at all and respect my fellow human beings and their beliefs - And be fanatical about it.