daas,
Again you use what some people did and apply it to the system. How does Islam justify what they did? Islam doesn't justify what they did and hence the Islamic system has never failed only the people following Islam failed in their implementation of Islam. However secularism could justify what they did. Yazeed wanted to implement it. Yazeed want the political power and he didn't care who became the head of spiritual affairs.
Maybe you should study Iran's system and then comment.
Since khilafah doesn't exist anywhere we are working to reestablish it.
Khilafah is the name of the Islamic ruling system. A village is not a state. RasulAllah(saw) didn't accept the support of weak tribes to establish the Islamic state. He(saw) used to ask them questions about warfare about the types of weapons they use, he (saw) wanted to see their strength. When the strong tribes of Banu Aws and Banu Khazraj accepted him he(saw) established the Islamic state. InshAllah when Allah (swt) gives us(Muslims) the Nussrah then we will prove how Islam can give justice and peace.
Hizb ut Tahrir cannot establish the Khilafah by itself we need the support of the Ummah and it is the Ummah that will establish the khilafah InshAllah.
Seminole,
I have never called Islam a religion because a religion doesn't give a political or economic system and doesn't have a comprehensive viewpoint on life. Islam is an ideology.
It isn't a theocracy. No Muslim would support communism or socialism or capitalism.
Difference of opinion is a norm in Islam and is respected. Anyone who has a different opinion is not automatically a sect however today the secular states do not promote the respect for other opinions. A clergy has been put in charge of these affairs who promote sectarianism, who promote nationalism and vigilantism and the states do nothing to stop this because they use them as an example when they say to the people 'Do you want to be ruled by them? Look at them , look at how they fight with each other' I don't want to be ruled over by a Maulvi or a clergy or a secular kafir I want to be ruled over by Islam.
Can you be specific in which problem you think wouldn't be solved by Islam?
Your selective view on history can prove anything it wants to I mean if you want to close your eyes and ears then there's nothing bad happening anywhere. Also where are your theocracies? All we have is secular states.
If you use your senses you will see that what Israeli secularism is doing, you will see what American secularism is doing all over the world, you will see what India is doing in kashmir, china in xinjiang province, russia in chechnya, islam karimov in uzbekistan or are these not secular states because in secular states somehow everybody gets along reading fairy tales and singing songs and solve their disputes through the power of love or flower power or whatever